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1.
对农田营造早竹林后不同年限土壤有机碳变化规律的研究结果表明:(1)竹林3年生时,各层次土壤有机碳含量都呈现下降的趋势,其中表土层(0～30 cm)下降幅度最大;竹林满园后,由于采取了集约经营措施,竹林土壤有机碳含量迅速回升,至9年生时,各层次土壤有机碳含量都超过了农田相应层次水平,但是12年生时竹林各层次土壤有机碳含量又呈现下降趋势.(2)土壤有机碳密度变化和土壤有机碳含量相似,竹林3年生时各层土壤有机碳密度均呈现下降趋势;6年生时,除了0～30 cm土层继续下降外,其余各层次有机碳密度都增加;至9年生时,有机碳密度都超过相应农田各层土壤有机碳的密度;12年生时,各层土壤有机碳密度都呈现下降趋势.(3)3年生竹林土壤有机碳储量下降了近22%;以后土壤有机碳储量均逐渐增加,9年生竹林,土壤有机碳储量要超过农田土壤有机碳的储量;12年生时竹林有机碳储量下降,但是依然高于农田土壤有机碳的储量. 相似文献
2.
江西安福不同类型毛竹林土壤有机碳特征 总被引：1，自引：0，他引：1
对江西安福毛竹林类型(毛竹纯林、竹阔混交林和竹杉混交林)土壤有机碳特征进行研究,以中亚热带常绿阔叶林和杉木纯林为对照。结果表明,土壤有机碳含量以竹阔混交林最高(15.36g/kg),竹杉混交林次之(14.63g/kg),毛竹纯林最小(14.06g/kg)。不同类型毛竹林土壤有机碳含量在不同季节存在差异,在土壤剖面上均表现为随土层深度的增加而降低。毛竹林土壤有机碳储量在116.90130.24tC/hm2。不同类型毛竹林土壤有机碳存在着明显的表层富集现象,0130.24tC/hm2。不同类型毛竹林土壤有机碳存在着明显的表层富集现象,040cm土层土壤碳储量占整个林地土壤碳储量比例大于75%。毛竹林土壤层是一个较大的碳库,而竹阔混交经营能够有效提高土壤碳贮存能力。 相似文献
3.
运用凋落物野外分解模拟实验的方法,对北亚热带地区6种主要森林类型凋落物分解过程中有机碳的变化进行了研究,结果表明:(1)6种土地利用类型森林凋落物分解过程中,有机碳相对含量在分解初始阶段都呈现增加的趋势,表现为凋落物有机碳相对含量的积累过程;分解开始的第3～4个月后,凋落物有机碳相对含量下降;经过1 a的分解周期以后,粗放经营毛竹林凋落物有机碳相对含量变化最大,下降11.7%;(2)集约经营毛竹林凋落物有机碳数量从分解开始就减少,而其它几种类型分解初期有机碳数量都表现一个净积累的过程,然后才逐步释放;经过1 a分解周期以后,粗放经营毛竹林凋落物53.8%的有机碳净释放;凋落物有机碳释放速率由高到低的顺序为:粗放经营毛竹林、早竹林、杉木林、天然次生林、集约经营毛竹林、马尾松林;(3)6种土地利用类型森林凋落物在分解过程中,有机碳剩余率随时间变化的模型都极其显著地符合分解指数模型,因此都可以用指数方程表达;(4)影响凋落物分解的环境因子所发挥的作用不尽相同,凋落物的分解速率和温度之间呈现显著的正相关关系. 相似文献
4.
蕉岭长潭省级自然保护区表土有机碳研究 总被引：2，自引：2，他引：2
基于UTM公里网格方法划分的66个网格的土壤剖面数据,分析了蕉岭长潭自然保护区5种典型植被类型(马尾松林、杉木林、针阔混交林、阔叶混交林和竹林)的表层土壤(0~20 cm)有机碳含量、密度、储量的分布特征与影响因子。结果表明:(1)表土有机碳含量SOC分布在12.61~66.19 g.kg-1之间,平均值为30.87±1.30 g.kg-1,大小顺序为竹林>阔叶混交林>针阔混交林>杉木林>马尾松林,多重比较显示竹林(37.63 g.kg-1)显著高于马尾松林(18.52 g.kg-1),马尾松林仅为竹林的49.21%。(2)表土有机碳密度SOCD在3.27~15.69 kg.m-2间,平均值为8.22±0.39 kg.m-2,大小排序为阔叶混交林>竹林>针阔混交林>杉木林>马尾松林,阔叶混交林(10.15 kg.m-2)和竹林(9.96 kg.m-2)的SOCD值显著高于马尾松林(4.82 kg.m-2)(p=0.005,p=0.036),马尾松林仅是阔叶混交林的47.49%。(3)蕉岭长潭保护区表土层有机碳储量为402 100 t,占总面积54.54%的针阔混交林贡献最大,其次为阔叶混交林、杉木林、竹林和马... 相似文献
5.
闽北毛竹林土壤有机碳含量特征及其影响因素 总被引：1，自引：0，他引：1
以闽北毛竹林为研究对象,通过野外调查获取林分、地形和土壤相关基础数据,分析毛竹林土壤有机碳含量与林分因子及地形因子间的关系,探讨毛竹林土壤有机碳含量的主要影响因子。结果表明:闽北毛竹林土壤有机碳含量随土层深度的增加而逐渐减小,总体均值为(25.55±12.05)g·kg~(-1),变异系数为47.16%;不同土层中,毛竹林土壤有机碳含量与立竹度和海拔呈正相关关系,与叶面积指数和坡度呈负相关关系,且下坡位大于上坡位,阴坡高于阳坡。逐步回归分析和通径分析结果表明,海拔、立竹度和叶面积指数是毛竹林土壤有机碳含量的主要影响因子,并构建利用海拔、立竹度和叶面积指数估算闽北毛竹林土壤有机碳含量的回归方程。该结果对准确估算森林碳储量具有重要意义。 相似文献
6.
蕉岭长潭省级自然保护区表土有机碳的研究 总被引：1，自引：2，他引：1
基于UTM公里网格方法划分的66个网格的土壤剖面数据,分析了蕉岭长潭自然保护区5种典型植被类型（马尾松林、杉木林、针阔混交林、阔叶混交林和竹林）的表层土壤（0～20 cm）有机碳含量、密度、储量的分布特征与影响因子。结果表明：（1）表土有机碳含量SOC分布在12.61～66.19 g·kg^-1之间,平均值为30.87±1.30 g·kg^-1,大小顺序为竹林〉阔叶混交林〉针阔混交林〉杉木林〉马尾松林,多重比较显示竹林（37.63 g·kg^-1）显著高于马尾松林（18.52 g·kg^-1）,马尾松林仅为竹林的49.21%。（2）表土有机碳密度SOCD在3.27～15.69 kg·m^-2间,平均值为8.22±0.39 kg·m^-2,大小排序为阔叶混交林〉竹林〉针阔混交林〉杉木林〉马尾松林,阔叶混交林（10.15 kg·m^-2）和竹林（9.96 kg·m^-2）的SOCD值显著高于马尾松林（4.82 kg·m^-2）（p=0.005,p=0.036）,马尾松林仅是阔叶混交林的47.49%。（3）蕉岭长潭保护区表土层有机碳储量为402 100 t,占总面积54.54%的针阔混交林贡献最大,其次为阔叶混交林、杉木林、竹林和马尾松林。（4）表土有机碳含量与土壤全氮、速效钾含量显著正相关,相关系数分别为0.40和0.31;与石砾含量极显著负相关,相关系数达到-0.76。与林下植物分布有密切联系,有机碳含量〈20 g·kg^-1的指示种有6种,包括千年桐、黄毛楤木、米碎花、谷木冬青、长叶冻绿和乌韭,有机碳含量〉40 g·kg^-1的指示种有光叶海桐和土茯苓,有机碳含量在20～40 g·kg^-1间还未发现指示种。 相似文献
7.
为了了解人工造林过程对土壤碳储量的影响,对燕山西部山地常见的华北落叶松人工林和杨桦天然次生林土壤有机碳含量进行了研究。结果表明,华北落叶松人工林和杨桦天然次生林的土壤剖面平均有机碳含量分别为30.45g/kg和28.45g/kg,二者没有明显差异;2种林分的土壤有机碳含量均随着土层深度的增加而降低,下降幅度则随深度的增加逐渐减缓,表层土壤对土壤的碳存储贡献更大。总的来看,土壤有机碳含量在深层(30cm以下)相邻土层之间差异不显著,说明深层土壤中,有机碳含量变化较小。由以上结果可以得出结论,在造林措施适当、人为干扰较少的条件下,人工林同样可以维持与天然林相近的较高的土壤碳储量。 相似文献
8.
岷江上游杂谷脑河流域不同土地利用类型土壤碳氮特征 总被引：1，自引：0，他引：1
对杂谷脑河流域不同区段(上、中、下游)6种不同土地利用类型土壤有机碳和全氮进行测定。结果表明:该流域土壤有机碳含量为经济林地>农耕地>人工成熟林地>灌木林地>人工幼龄林地>天然次生林地;土壤全氮含量为农耕地>经济林地>天然次生林地>人工成熟林地>灌木林地>人工幼龄林地;C/N为人工幼龄林地>人工成熟林地>经济林地>灌木林地>农耕地>天然次生林地。同一土地利用类型在不同区段中,经济林土壤有机碳和全氮含量表现为中游>下游;农耕地土壤有机碳含量为中游>上游>下游;土壤全氮含量为下游>中游>上游;灌木林地土壤有机碳和全氮含量为中游>下游。同一区段不同土地利用类型中,流域下游土壤有机碳表现为经济林地>农耕地>灌木林地,全氮含量表现为农耕地>经济林地>灌木林地;流域中游土壤有机碳和全氮含量均表现为含量农耕地>经济林地>灌木林地;流域上游土壤有机碳含量表现为人工成熟林地最高>农耕地>人工幼龄林地>天然次生林地,全氮含量表现为天然次生林地>人工成熟林地>农耕地>人工幼龄林地。 相似文献
9.
以北亚热带受损天然次生林为研究对象,探讨了植被演替对土壤有机碳的影响。结果表明:(1)不同演替年限常绿阔叶林,土壤有机碳含量均随土壤深度的增加而减少并最终趋于稳定;土壤有机碳含量均随着演替年限的增加而不断增大,增加幅度在土壤剖面上呈现波动性;演替20 a到演替40 a群落土壤中的有机碳平均含量增加了56.30%(P<0.05)。(2)土壤有机碳储量随土层深度变化的趋势和土壤有机碳含量变化趋势基本一致:总体上随深度增加而减少,在60 70 cm土层出现波动;不同土壤层次土壤有机碳储量也随着演替年限增加,呈上升趋势,增加幅度在土壤剖面上也呈现出波动性,0 80 cm土层有机碳储量平均增加了56.01%。(3)该地区森林土壤碳储量总体上较低,平均为79.13 t·hm-2,且0 40 cm土层贮存的碳量比例相对其它地区要大,达到70%以上。(4)两种演替阶段,土壤有机碳含量与全氮、水解氮、速效磷、速效钾、速效钙、速效镁离子的含量均极显著相关。因此,应该加强亚热带森林的保护,促进天然次生林的正向演替,增加森林生态系统有机碳等的截留。 相似文献
10.
为了了解冀北地区白桦天然次生林土壤有机碳的分布特征,以承德市围场县、丰宁县和张家口赤城县白桦天然次生林为研究对象,对其土壤有机碳含量进行了测定分析。结果表明:4个地区的白桦天然次生林各层土壤有机碳含量由高到低顺序依次为赤城县黑龙山、围场县孟滦、丰宁县四岔口、围场县燕格柏,其0~10cm的土壤有机碳含量依次为108.07g/kg、65.61g/kg、52.33g/kg和30.04g/kg;土壤有机碳含量有随海拔升高而上升的趋势;各地区白桦天然次生林的土壤有机碳含量都以表层最高,随着土层深度的增加,土壤有机碳含量呈现逐渐降低的趋势,且随深度的增加,土壤碳含量下降速度逐渐趋缓。 相似文献
11.
黄土区人工与天然植被对凋落物量和土壤有机碳变化的影响 总被引：10，自引：1，他引：9
在黄土丘陵区选择从耕地、草地、灌木林到乔木林样地,不同样地内设立1 m × 1 m(乔木10 m×10 m)的样方,分析样方内凋落物积累量、碳氮含量、土壤有机碳(SOC)和可溶性碳(DOC)含量变化.结果表明:天然草地、灌木林、乔木林凋落物积累量依次为5.3,12.1和32.4 t·hm-2;但人工灌木林和乔木林的凋落物积累量分别为6.7和11.4 t·hm-2,分别是天然灌木林和乔木林的1/2和1/3.随着植被的恢复,天然植被凋落物的C/N高于人工植被(刺槐林除外).与耕地SOC(4.67 g·kg-1)相比,天然灌木林地SOC提高5.9倍,人工灌木林地提高1.8倍;天然乔木林地提高8.0倍,而人工乔木林地仅提高4.0倍.凋落物积累量与0～20 cm土层土壤有机碳存在显著线性相关关系(R2>0.83),但20 cm以下线性相关关系不显著.凋落物积累量与0～10 cm土壤可溶性碳含量存在显著线性相关关系(R2>0.893),与10～60 cm土层线性相关关系不显著,与80～100 cm土壤可溶性碳存在显著线性负相关关系. 相似文献
12.
《Scandinavian Journal of Forest Research》2012,27(6):513-521
Abstract Stands of pedunculate oak (Quercus robur) planted 50–80 years ago on two types of land (previously forested land and former arable fields) were compared regarding vegetation and soil. Former arable soils were characterized by a higher pH, higher nitrate concentration and higher soil density, but had lower organic matter content and lower ammonium concentration in the topsoil (0–5 cm). These differences, however, decreased with soil depth. Phosphorus concentration was consistently higher in former fields throughout the soil profile (0–45 cm). Nitrogen mineralization, determined by in situ incubation, showed a strong seasonal pattern with peak values in spring. Non-metric multidimensional scaling ordination revealed marked compositional differences in the vegetation between the two land-use categories, and also compositional turnover along gradients in soil pH and nitrogen availability. Differences in soil pH between land-use categories occurred in a range critical for the establishment of many typical forest herb layer species. Plant indicator species were identified for the two land-use categories. The results showed that acid-sensitive forest herbs may benefit from the higher pH soils in new woodlands, in contrast to ancient forest soils with little buffer capacity towards natural and anthropogenic acidification. In conclusion, former arable use has long-lasting effects on soil properties and vegetation composition in broadleaved forests. New woodlands on former fields can thus offer relatively persistent new habitats for acid-sensitive species that have suffered from reduction in habitat area during historic periods of deforestation and cultivation. 相似文献
13.
Xiaoguo Zhou Yuanguang Wen Uromi Manage Goodale Hua Zuo Hongguang Zhu Xiaoqiong Li Yeming You Li Yan Yong Su Xueman Huang 《New Forests》2017,48(5):609-627
Most Eucalyptus plantations are intensively managed as short-rotation plantations and carbon (C) storage in plants and soils in stands older than 10 years is not well understood. We examined the changes in plant biomass C and soil organic C (SOC) storage across a chronosequence of E. urophylla × E. grandis forests (4-, 7-, 10-, 13-, and 21-year-old) in subtropical China. Biomass C stock significantly increased with stand age. SOC storage increased initially after afforestation, peaking in 10-year-old stands, and declined gradually. Ecosystem C pools in the five development stages were 111.76, 167.66, 234.04, 281.00, and 299.29 Mg ha?1, respectively. Trees and soils were the dominant C pools across all stand ages with the contribution of tree biomass C storage significantly increasing and SOC storage decreasing with age. Eucalyptus plantations are still in vigorous growth phase and have great potential for C sequestration at the end of the current rotation length (within 7 years). Considering the sharp decrease of annual biomass C increment rate and the gradual loss of SOC storage in stands older than 13 years, we recommend the optimal length for one full Eucalyptus plantation cycle should be 12–15 years in subtropical China to maximize land-use value and carbon sink value. 相似文献
14.
Chunsheng Wu Qifeng Mo Hankun Wang Zhijian Zhang Guoxian Huang Qing Ye Qin Zou Fanqian Kong Yuanqiu Liu G. Geoff Wang 《Annals of Forest Science》2018,75(1):24
Key message
The invasion of moso bamboo ( Phyllostachys edulis (Carriere) J. Houzeau) into neighboring Cryptomeria japonica (L. f.) D. Don plantations significantly altered soil P status and dynamics. This alteration in phosphorus dynamics must be considered when assessing the ecological consequence of moso bamboo invasion in subtropical China.Context
Moso bamboo is a native species that commonly invades into adjacent forests in Asia. Such invasions may significantly alter soil chemical characteristics because moso bamboo has very different traits compared with the tree species it displaces. However, few studies have investigated the effects of moso bamboo invasion on soil phosphorus (P) dynamics.Aims
The objective of this study was to investigate the effects of moso bamboo invasion on soil P dynamics. Specifically, we quantified soil total P, available P, acid phosphatase activity (APA), and microbial biomass P (MBP) in moso bamboo-invaded coniferous stands and compared them to uninvaded stands and pure moso bamboo stands.Methods
We compared seasonal dynamics of soil P (e.g., total P, available P, APA, and MBP) over a 24-month period among three stand types at Lushan mountain in subtropical China: Cryptomeria japonica plantation (CR), Cryptomeria japonica plantation invaded by Phyllostachys edulis (PH-CR), and Phyllostachys edulis stand (PH).Results
Total soil P concentration was significantly lower in PH-CR than in CR and PH stands, but soil available P concentration was significantly lower in CR and PH stands. Soil APA was significantly higher in PH-CR than in CR and PH stands. Similarly, soil MBP concentration was higher in PH-CR than in CR and PH stands. Also, soil total P, available P, APA, and MBP concentrations displayed seasonal fluctuations in PH-CR, but remained relatively stable in CR and PH stands during the 2 years.Conclusion
The invasion of moso bamboo into adjacent C. japonica stands significantly increased soil available P, acid phosphatase activity, and microbial biomass phosphorus, but decreased soil total P. The implication of these changes to ecosystem composition, structure, and function must be explicitly considered in managing moso bamboo invasion in subtropical China.15.
以杉木林和常绿阔叶林为对照,对闽北典型毛竹林(杉竹混交林、毛竹纯林、竹阔混交林)林下枯落物储量、持水特性及其对降雨的拦蓄能力进行研究,结果表明:(1)各林分未分解层、半分解层和已分解层枯落物储量、最大持水量和有效拦蓄差异较大,但均以半分解层最高,分解层次之,未分解层最小;杉木纯林枯落物总储量、最大持水量和有效拦蓄均最高,分别为14.6 t·hm-2、2.668 mm和1.43mm,竹阔混交林次之,分别为7.0 t·hm-2、1.298 mm和0.76 mm,毛竹纯林最低,分别仅为4.7 t·hm-2、0.916 mm和0.58 mm。(2)5种林分各层枯落物持水量与浸泡时间的关系为:S=k ln(t)+p,在0 - 2 h内,枯落物持水量迅速增加,此后增加速度逐渐减缓;其吸水速率与浸泡时间的关系为:V=at-1+b,在0 - 1 h内,枯落物吸水速率迅速下降,2 h后下降速度逐渐减缓。(3)竹阔混交林枯落物持水能力虽小于杉木纯林但在竹林中最强,对此,在竹林改造和竹林经营过程中应加以重视。 相似文献
16.
《Forest Ecology and Management》1998,112(3):245-252
Effects of a land use change from grassland to coniferous plantation forestry (Pseudotsuga menzieii [Douglas fir]; Pinus radiata [radiata pine]) on soil acidity and organic matter were assessed at two sites in New Zealand. The sites differed with respect to soils, climate, vegetation cover and type, relative maturity and management of the forest stands. Results obtained at the different sites were, therefore, not directly comparable, although they represented a comparison of a similar change in land use and some overall trends were evident. The change from grassland to conifers decreased levels of organic carbon, total nitrogen and exchangeable cations and increased exchangeable acidity in the upper 20–30 cm of soil. Exchangeable aluminium and exchangeable acidity were more sensitive measures of the effects of afforestation on soil acidity than pH. 相似文献
17.
Intensive management with an organic matter mulching technique on Phyllostachys praecox aims to promote economic profit, but causes severe soil acidification, which can increase soil phytotoxic Al content and induce bamboo-stand deterioration. In this work, the relationships among soil acidity, soil phytotoxic Al content, and total Al content in bamboo bodies were evaluated using the organic matter mulching technique. Results demonstrated that soil pH dramatically decreased from 6.53 to 3.60 after 16 years in P. praecox stands that developed from the former paddy field. During the bamboo-cultivation period, both phytotoxic Al content (extracted by 8-hydroxyquionline) in soils and Al content in bamboo roots increased significantly from 48.25 to 108.0 mg kg?1 and 594.2 to 1073 mg kg?1, respectively. Phytotoxic Al in soil and Al in bamboo were positively related to the cultivation duration with organic matter mulching technique. The current intensive management was mainly responsible for the bamboo deterioration due to dramatic acidification and increased phytotoxic Al. Therefore, an improved management should be adopted for sustainable bamboo production in the future. 相似文献
18.
[目的]以思茅松人工中龄林为研究对象,探讨不同坡向、坡度和坡位对思茅松人工林SOC储量的影响,为精确评估思茅松人工林碳储量提供科学依据。[方法]对不同坡向、坡度和坡位不同土壤层次的SOC含量、全氮、土壤密度、C:N和SOC储量进行T检验和单因素方差分析,对不同土层的SOC储量和全氮、土壤密度、C:N之间进行Pearson相关分析。[结果]思茅松人工中龄林,SOC含量、全氮和C:N随着土层加深而减少,土壤密度随着土层加深而增加。不同的坡向和坡度显著影响SOC储量大小,阳坡的SOC储量要显著高于阴坡,坡度为20 30°的SOC储量要显著低于10 20°和0 10°,坡位对SOC储量大小无显著影响。在0 100 cm土层中,随着土层深度的增加,不同立地条件的思茅松人工中龄林的SOC储量呈减小趋势,不同坡向、坡位和坡度0 20 cm土层SOC储量均显著高于其它土层。坡向和坡度显著影响0 20 cm土层的SOC储量(P0.05);坡位对各层SOC储量均无显著影响(P0.05)。0 20 cm土层中SOC储量和土壤密度呈极显著负相关,和坡向、坡度呈显著负相关关系;除2040 cm土层外,其它土层的SOC储量与全氮之间呈极显著正相关;SOC储量和坡位与C:N在任一土层均无显著相关关系。[结论]立地条件差异影响SOC储量的大小与分布,尤其是坡向和坡度的不同会造成思茅松人工中龄林SOC储量的差异。 相似文献
19.
[目的]为探讨毛竹向邻近常绿阔叶林扩张对土壤性质的影响。[方法]本研究选取江西大岗山森林生态定位站常绿阔叶林、2∶8竹阔混交林、8∶2竹阔混交林和毛竹纯林为研究对象,对土壤有机碳、密度、孔隙度、持水量和贮水量等土壤性质和水分特征进行研究。[结果]常绿阔叶林在毛竹扩张过程中,土壤碳元素含量呈先增后降的趋势。相关分析表明:土壤有机碳与非毛管持水量和现有贮水量呈极显著相关,与土壤密度和总孔隙度呈显著相关,各指标相互作用共同影响了土壤有机碳含量在扩张过程中的变化特征。[结论]常绿阔叶林表层土壤密度、孔隙度和持水量等特征综合优于混交林和毛竹纯林,这为竹鞭扩张后竹笋萌发创造了条件;当常绿阔叶林演替到毛竹纯林时,10 60 cm土壤物理性质和持水能力都有所改善,但有机碳含量降为4个林分最低值,大量竹鞭虽然优化了土壤物理性质,但无性繁殖导致土壤碳元素大量消耗,加之择伐和挖笋等人工干扰,毛竹纯林土壤有机碳含量较低。调节土壤碳含量以及土壤结构和水分特征可能是今后控制毛竹林扩张,维持群落生态系统稳定性的重要生态策略。 相似文献
20.
[目的]通过分析土壤微生物生物量及群落结构的演变趋势,筛选影响土壤微生物群落的关键环境因子,揭示土壤微生物群落对毛竹林长期粗放经营的响应机理。[方法]选取不同粗放经营年限(5 a、9 a、15 a、18 a)毛竹林,以天然马尾松林(Masson pine,MP)作为对照,采用磷脂脂肪酸(Phospholipid fatty acids,PLFA)分析方法表征土壤微生物量及群落结构。[结果]结果表明,毛竹林土壤微生物总PLFA含量以及细菌、真菌、放线菌等PLFA含量均显著低于马尾松林(P0.05),但不同经营年限毛竹林之间没有显著差异。土壤碱解氮及有效磷含量对土壤微生物总PLFA含量以及细菌、真菌、原生动物等PLFA含量影响显著(P0.05),而土壤碱解氮、p H值以及有机质含量对放线菌PLFA含量影响显著(P0.05)。长期粗放经营过程中毛竹林土壤微生物丰富度及多样性均呈逐渐下降趋势。非度量多维尺度转换排序(Non-metric multidimensional scaling,NMDS)分析结果表明,毛竹林土壤微生物群落结构与马尾松林有明显区分(R=0.388 1,P=0.009)。土壤含水量、碱解氮、有效磷以及p H值合计解释了90.28%的微生物群落结构变异量,其中土壤含水量、碱解氮、有效磷贡献显著(P0.05)。[结论]长期粗放经营降低了毛竹林土壤微生物量,改变了群落结构,其生态风险还有待于进一步评估。 相似文献