毛白杨VA菌根与外生菌根关系的研究   总被引：11，自引：0，他引：11  

赵忠  马刊欣 《林业科学》1994,30(2):111-116

定期从毛白杨扦插育苗地挖取根样，并从中原地区的毛白杨人工林地采集细根（直径小于２ｍｍ）根样，观察统计ＶＡ菌根、外生菌根、混合菌根以及未受菌根菌侵染的１ｃｍ长根段的百分比。结果表明，在苗木的菌根侵染初期，ＶＡ菌根菌的侵染势较强，但优势很快被外生菌根菌取代，两种菌根菌间的负交互作用随苗龄的增加而不断增强。造林地种类和土壤的ｐＨ值对毛白杨两种菌根间的负交互作用关系有制约作用。在强碱性砂土地上，ＶＡ菌根的  相似文献   

Variation in seed and seedling traits and their relations to geo-climatic factors among populations in Yunnan Pine (<Emphasis Type="Italic">Pinus yunnanensis</Emphasis>)     

Nianhui Cai  Yulan Xu  Shi Chen  Bin He  Genqian Li  Yue Li  Anan Duan 《林业研究》2016,27(5):1009-1017

Differences in seed germination and seedling growth among populations of Pinus yunnanensis Franch. were quantified to provide information for use in the regeneration, reforestation, and improvement of this species. Seed germination and seedling growth traits at the nursery stage were investigated at the population level. We evaluated relationships between pairs of measured traits as well as the association between measured traits and geo-climatic variables including longitude, latitude, elevation, temperature and precipitation. Seedling growth showed significant differences although a low magnitude of variation was found in the seed germination traits among the populations. Some populations with strong and stable growth (e.g., the Baoshan population) may be selected as superior seed sources for regeneration and reforestation. Germination percentage was negatively correlated with elevation, and positively with precipitation. In addition, germination index, vigor index and seedling height were positively correlated with precipitation. Seed germination index, cotyledon number and length, and seedling diameter were significantly and positively correlated with seed weight. Strong correlations between pairs of traits will be helpful in early evaluations for the selection of certain prominent traits.  相似文献   

毛白杨外生菌根类型及其生态学特性的研究   总被引：5，自引：1，他引：5  

赵忠  马刊欣 《林业科学》1993,29(1):12-18

根据形态和解剖特征,将中原地区的毛白杨外生菌根划分成14种类型,它们与宿主的共生关系大多差或极差。菌根分布特征指标统计结果表明,毛白杨(Populus tomentoso)林地土壤中,普遍缺乏能与毛白杨形成良好共生关系的外生菌根真菌,共生关系良好的菌根主要分布在pH值小于7.5的土壤中;共生关系差或极差的菌根和假菌根则在强碱性土壤中占优势,土壤pH大于7.5的育苗地中,毛白杨幼苗形成的菌根比较单一,以假菌根-5号类型为主。树木年龄对毛白杨林的菌根形成没有影响。  相似文献   

安乐圩堤身(路基)中关于水泥深层搅拌桩的应用     

占安安 《北京农业》2012,(36)

城市路、堤结合工程中,在堤身加固的同时,还应对路基进行加固,通过对城市道路和防洪大堤的相关要求分析,选用适当的基础加固方案,即要满足水利工程建设要求,也要满足城市道路工程建设要求,水泥深层搅拌桩的加固机理正好能对上述两同时兼顾,文章通过工程实例确认了水泥深层搅拌桩在路、堤结合工程中应用的适用性。  相似文献   

Effects of the micro-scale advection on the soil water movement in micro-irrigated fields   总被引：1，自引：0，他引：1  

Kozue Yuge  Mitsumasa Anan  Yoshiyuki Shinogi 《Irrigation Science》2014,32(2):159-167

The objective of this study was to explore the soil water dynamics under micro-advective conditions. A numerical model was introduced to estimate the airflow turbulence generated by the crop canopy. The vapor pressure and air temperature in the vicinity of the soil surface were estimated from the wind velocity predicted by this model. The energy budget on the soil surface was estimated using wind velocity, vapor pressure, and air temperature simulated by numerical models. The soil water content and temperature were predicted using the simulation model describing the water and heat transfer in soil. Using the energy budget, the accuracy of this model was experimentally verified using a wind tunnel. Spatial changes of the soil water content simulated by this model were reproduced by the experiment. This indicated that the numerical model for estimating the soil water movement under micro-scale advection considering the crop body was satisfactory.  相似文献   

辽东山区次生林土壤酶对土壤微生物呼吸的影响     

范阿南  刘峰 《防护林科技》2013,(12):8-10

以蒙古栎（Quercus mongolica）林、杂木林和胡桃楸（Juglans mandshurica）林3种天然次生林土壤为研究对象,通过生长季节内表层土壤（0～30 cm ）淀粉酶、蔗糖酶、脱氢酶和过氧化氢酶活性以及土壤微生物呼吸速率的测定,探讨了辽东山区土壤酶活性与土壤微生物呼吸之间的关系。结果表明：辽东山区蒙古栎林、杂木林、胡桃楸林土壤酶活性与土壤微生物呼吸具有一定的季节波动,但相关性不显著。除胡桃楸林微生物呼吸与过氧化氢酶活性之间具有显著关系外,蒙古栎林和杂木林微生物呼吸与4种酶活性之间均无显著相关性。研究结果为进一步系统了解辽东山区次生林植物群落土壤碳循环过程提供了参考。  相似文献   

Variation in needle and cone traits in natural populations of Pinus yunnanensis   总被引：2，自引：0，他引：2  

Yulan Xu  Keith Woeste  Nianhui Cai  Xiangyang Kang  Genqian Li  Shi Chen  Anan Duan 《林业研究》2016,27(1):41-49

Pinus yunnanensis Franch. is a major component of coniferous forests in southwestern China. Little is known about its intraspecific variation. Morphological variations in needle and cone traits of P. yunnanensis were analyzed to quantify variability among and within natural populations.Seven traits were measured on 10 needles collected from 30 trees in each of the 18 sampled populations of P. yunnanensis. Four cone traits were measured in 221 individual trees from nine populations. The results showed that there were significant differences(p \ 0.01) both among populations and within populations in each needle and cone trait.The proportion of phenotypic variation of nearly all needle and cone traits was over 50 % within populations, which showed trees within populations accounted for a majority of the total variation. The needle traits showed higher variability within population than cone traits. Variability in theneedle traits was correlated with geo-climatic parameters(longitude, latitude, altitude, temperature, and precipitation).Needle length and the ratio of needle length to fascicle sheath length showed clinal variation in response to latitudinal and altitudinal gradients. A hierarchical classification of all populations based on needle traits led to the formation of four major groups. The findings provide important genetic information for the evaluation of variation. Moreover, it will assist in management of genetic diversity of P. yunnanensis.  相似文献   

Quantification of the crop stem flow in the sprinkler irrigated field     

Kozue Yuge  Mitsumasa Anan 《Paddy and Water Environment》2011,9(2):229-236

In sprinkler irrigated fields, irrigation water is intercepted by crop leaves. This water can be separated into several categories depending on its movement. In this study, the categories are defined as crop stem flow water, leaf storage water, and drop water to the soil. Crop stem flow water is especially effective for crop growth because it reaches the soil surface near the root zone. The objective of this study is to develop a method for quantifying crop stem flow water. Field observation is conducted to observe the movement of irrigation water droplets and to quantify the varying amounts of crop stem flow water, leaf storage water, and drop water to the soil. The measurement of the amount of leaf storage water indicates that droplet movement on the leaf changes constantly. To quantify three components of irrigated water, considering the continuous change of droplet movement on the leaf surface, a simulation model is developed. The simulated amounts of crop stem flow water, leaf storage water, drop water to the soil successfully reproduce the observed result, and model accuracy can be verified.  相似文献   

Effect of <Emphasis Type="Italic">Pistia stratiotes</Emphasis>, cattle manure and wood vinegar (pyroligneous acid) application on growth and yield of organic rainfed rice     

Anan Polthanee  Nisit Kumla  Bubpha Simma 《Paddy and Water Environment》2015,13(4):337-342

The effect of soil incorporation of water lettuce (Pistia stratiotes) and cattle manure and of wood vinegar (pyroligneous acid) foliar application on growth and yield of rainfed rice was studied with a four replications split plot in a farmer’s field in Thailand. P. stratiotes incorporation significantly increased the grain yield over nonincorporation with P. stratiotes. Cattle manure incorporation alone or combined with wood vinegar application significantly increased grain yield over wood vinegar and no-fertilizer application. Incorporation of P. stratiotes combined with cattle manure and wood vinegar application could not provide sufficient N to the rice crop, but it adequate for P and K. Plots with cattle manure incorporation combined with wood vinegar application exhibited the maximum K, P and N content in soil after harvest.  相似文献   

基于层次分析法的笋用竹引种质量评价体系研究     

杨硕  徐绳武  施仕胜  郑丽  夏文娟  余安安  瞿和平 《世界竹藤通讯》2019,17(5):34

对引种的笋用竹进行全面、科学的评估是引种筛选工作的重要前提,因此基于层次分析法（AHP）建立了一套用于评价笋用竹引种质量的体系。评价体系共分为目标、准则及方案3个层次,共15个评价因子,建立的判断矩阵经检验具有良好的一致性,并分别计算了权重值,给出了相应数据的标准化处理方式及综合得分计算方法,为下一步验证该体系提供了技术依据。  相似文献