| 青藏高原退化草甸土壤微生物量、酶化学计量学 特征及其影响因素 |
| 喻岚晖; 王 杰; 廖李容; 张 超; 刘国彬
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| 2020-11
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发表期刊 | 草 地 学 报
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卷号 | 28期号:6页码:1702-09 |
摘要 | :探明草地退化过程中土壤微生物量和酶的变化趋势及其化学计量学特征,对理解草地的退化机理有重要意
义。本研究以青藏高原高寒草甸4种不同退化程度(未退化、轻度退化、中度退化、重度退化)草甸为研究对象,分
析了土壤微生物量和酶化学计量学特征及其影响因素。结果表明,随草甸退化程度的加剧,土壤有机碳(Soil organic
carbon,SOC)、全氮(Total nitrogen,TN)、速效钾(Available potassium,AK)、微生物量碳(Microbial biomass
carbon,MBC)和微生物量氮(Microbial biomass nitrogen,MBN)含量显著降低;未退化草甸β-1,4-葡萄糖苷酶(β-1,
4-Glucosidase,BG)和β-N-乙酰氨基葡萄糖苷酶(β-N-Acetylglucosaminidase,NAG)活性显著低于轻度、中度和重度
退化;重度退化草甸土壤氮/磷、MBN/MBP显著低于未退化,ln(NAG+LAP)/lnALP取值范围为0.77~0.83,高
于全球均值0.44,说明退化引起了该地区的土壤氮限制;相关分析表明微生物量和酶的化学计量比受有机碳和全
氮的影响显著。综上,微生物量和酶的化学计量学特征对土壤养分变化响应敏感且能反映土壤养分限制情况。 |
其他摘要 | Abstract:Revealing the changes in soil microbial biomass and enzymes and their stoichiometric characteristics
is of great significance to understand the degradation mechanism of degraded grassland.In the present
study,we surveyed the soil in Qinghai-Tibetan alpine meadows and classified the extent of degradation as
undegraded,lightly degraded,moderately degraded,and severely degraded to evaluate the changes in stoichiometric
characteristics of microbial biomass and enzymes activities.Results showed that as the meadow
degraded,the contents of soil organic carbon(SOC),total nitrogen(TN),available potassium (AK),microbial
biomass carbon(MBC)and microbial biomass nitrogen(MBN)decreased significantly.Activities
ofβ-1,4-Glucosidase(BG)andβ-N-Acetylglucosaminidase(NAG)of the degraded grasslands were significantly
higher than that of the undegraded meadow.The ratios of N/P and MBN/MBP in severely degraded
meadow were significantly lower than those in undegraded meadow,and ln(NAG+LAP)/lnALP ranged
from 0.77to 0.83,which was higher than the 0.44(global average value),indicating that the degradation
aggravated the soil nitrogen limitation in the studied area.The correlation analysis showed soil microbial
biomass,enzyme activities and ecological stoichiometric ratio were positively correlated with SOC and TN.
In summary,soil microbial biomass,enzyme activities and ecological stoichiometric ratio were sensitive to soil nutrient change and could reflect soil nutrient limitations. |
关键词 | 高寒草甸
草地退化
微生物生物量
土壤酶
生态化学计量学
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语种 | 中文
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文献类型 | 期刊论文
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条目标识符 | sbir.nwafu.edu.cn/handle/361005/9350
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专题 | 水保所知识产出(1956---)
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作者单位 | 1.中国科学院教育部水土保持与生态环境研究中心,陕西杨凌712100 2.中国科学院大学,北京100049 3.西北农林科技大学水土保持研究所,陕西杨凌712100
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推荐引用方式 GB/T 7714 |
喻岚晖,王 杰,廖李容,等. 青藏高原退化草甸土壤微生物量、酶化学计量学 特征及其影响因素[J]. 草 地 学 报,2020,28(6):1702-09.
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APA |
喻岚晖,王 杰,廖李容,张 超,&刘国彬.(2020).青藏高原退化草甸土壤微生物量、酶化学计量学 特征及其影响因素.草 地 学 报,28(6),1702-09.
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MLA |
喻岚晖,et al."青藏高原退化草甸土壤微生物量、酶化学计量学 特征及其影响因素".草 地 学 报 28.6(2020):1702-09.
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青藏高原退化草甸土壤微生物量_酶化学计量学特征及其影响因素_喻岚晖.pdf
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