| 基于生态酶化学计量研究小陇山不同植被类型土壤有机碳对微生物磷限制的影响 |
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| 引用本文： | 杨海裕,,,郑子龙,,,刘小林,,,李惠萍,,,高鹏程.基于生态酶化学计量研究小陇山不同植被类型土壤有机碳对微生物磷限制的影响[J].西北林学院学报,2022,37(2):1-9. |
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| 作者姓名： | 杨海裕 郑子龙 刘小林 李惠萍 高鹏程 |
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| 作者单位： | (1.甘肃省小陇山林业科学研究所，甘肃 天水 741020；2.甘肃小陇山森林生态系统国家定位观测研究站，甘肃 天水 741020；3.甘肃省次生林培育重点实验室，甘肃 天水 741020；4.西北农林科技大学 资源环境学院，陕西 杨陵 712100) |
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| 摘 要： | 不同林地类型会改变土壤的理化特性，尤其是土壤有机碳（SOC），但这些理化性质变化后土壤微生物的代谢限制尚不清楚。2020年，在小陇山林区测定了锐齿栎纯林和锐齿栎混交林0~10、10~20、20~30、30~40、40~60 cm土层土壤中的β-1，4-葡萄糖苷酶(BG)、β-D-纤维二糖水解酶(CBH)、β-1，4-N-乙酰氨基葡糖苷酶(NAG)、L-亮氨酸氨基肽酶(LAP)与酸性磷酸酶(AP)。生态酶化学计量模型用于计算微生物代谢限制，通过计算载体的向量长度与角度量化土壤微生物的C、N、P限制。与锐齿栎纯林处理相比，锐齿栎混交林各土层的平均有机碳和全N含量分别提高了21.14％和17.26％。与锐齿栎纯林处理相比，锐齿栎混交林处理下BG+CBH和AP的活性分别降低了16.6％和32.6％，而NAG+LAP活性提高了10.3%。土壤养分及其计量比、pH和土壤容重影响土壤微生物C或P限制。锐齿栎纯林和锐齿栎混交林的土壤微生物P限制主要归因于土壤有机C。土壤有机C的分解是土壤有效P的关键来源。锐齿栎纯林下较高的土壤含水量和土壤容重加快了SOC的分解，从而增加了土壤P的限制。然而，由于更多凋落物的长年输入，锐齿栎混交林增加了更多的土壤有机C，并且其分解释放的有效P减轻了土壤微生物受到的P限制。因此，在山地丛林条件下，土壤容重、土壤含水量、养分计量比和有机C都会影响土壤微生物代谢，而山地丛林酸性土壤有机C含量的降低是导致微生物受到有效P限制的主要因素。
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| 关 键 词： | 植被类型 土壤有机碳 微生物代谢 生态酶化学计量 |
Effects of Soil Organic Carbon on Microbial Phosphorus Limitation in Different Vegetation Types in Xiaolong Mountain Based on Ecoenzymatic Stoichiometry |
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| YANG Hai-yu,,' target="_blank" rel="external">,ZHENG Zi-long,,' target="_blank" rel="external">,LIU Xiao-lin,,' target="_blank" rel="external">,LI Hui-ping,,' target="_blank" rel="external">,GAO Peng-cheng. Effects of Soil Organic Carbon on Microbial Phosphorus Limitation in Different Vegetation Types in Xiaolong Mountain Based on Ecoenzymatic Stoichiometry[J].Journal of Northwest Forestry University,2022,37(2):1-9. |
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| Authors: | YANG Hai-yu " target="_blank">' target="_blank" rel="external"> ZHENG Zi-long " target="_blank">' target="_blank" rel="external"> LIU Xiao-lin " target="_blank">' target="_blank" rel="external"> LI Hui-ping " target="_blank">' target="_blank" rel="external"> GAO Peng-cheng |
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| Institution: | (1.Gansu Xiaolongshan Research Institute of Forestry Science,Tianshui 741020,Gansu,China; 2.Gansu Xiaolongshan Forest Ecosystem National Research Station,Tianshui 741020,Gansu,China; 3.Gansu Province Key Laboratory of Secondary Forest Cultivation,Tianshui 741020,Gansu,China; 4.College of Resources and Environment,Northwest A&F University,Yangling 712100,Shaanxi,China) |
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| Abstract: | Changing forest type can change soil physicochemical properties,especially soil organic carbon (SOC).However,what happens to the metabolic limitation of soil microorganisms after the change of soil physicochemical properties is still unclear.In 2020,taking the soils of pure and mixed Quercus acuteserrata forests occurring in Xiaolongshan forest region as the research objects,an investigation was conducted to measure the activities of 5 different enzymes in the soil layers of 0-10,10-20,20-30,30-40,and 40-60 cm,including β-1,4-glucosidase (BG),β-D-cellobiohydrolase (CBH),β-1,4-N-acetylglucosaminidase (NAG),L-leucine aminopeptidase (LAP),and acidic phosphatase (AP).Ecoenzymatic stoichiometry model was used to calculate microbial metabolic limitation and to quantify the carbon,nitrogen and phosphorus limitations of soil microorganisms by calculating the vector length and angle of the carrier.Compared with the pure forest,the average organic carbon and total nitrogen content of each soil layer in the mixed forest increased by 21.14% and 17.26%,respectively,the enzyme activities of BG+CBH and AP decreased by 16.6% and 32.6%,respectively,while the enzyme activities of NAG+LAP increased by 10.3%.Soil nutrients and their metering ratios,pH and soil bulk density affected soil microbial carbon or phosphorus limitation.The soil microbial phosphorus limitation in the pure and mixed forests was mainly attributed to soil organic carbon.The decomposition of soil organic carbon was the key source of soil available phosphorus.The higher soil water content and soil bulk density under the pure forest accelerated the decomposition of SOC,thereby increasing the limitation of soil phosphorus.However,due to the long-term input of more litter,more soil organic carbon was released in the mixed forest,and the effective phosphorus released by its decomposition reduced the phosphorus limitation of soil microorganisms.Therefore,under the condition of mountainous forests,soil bulk density,water content,nutrient ratio and organic carbon will affect soil microbial metabolism,and the reduction of organic carbon content in acidic soils in mountainous forests is the main factor that causes microbes to be limited by available phosphorus. |
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| Keywords: | forest types soil organic carbon ecoenzymatic stoichiometry microbial metabolism |
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