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在不同放牧强度下的沙漠草原中,土壤石化不平衡与微生物碳利用效率之间的联系

Jia-Xin Wu¹, Shao-Yu Li¹, Guo-Dong Han¹

¹College of Grassland, Resource and Environment, Inner Mongolia Agricultural University, Hohhot 010018, China.

Ying yong sheng tai xue bao = The journal of applied ecology

|October 17, 2024

概括

长期放牧对沙漠草原的土壤微生物碳利用效率 (CUE) 有负面影响. 这项研究显示,放牧加剧了土壤营养不平衡,影响了微生物群落和碳动态.

科学领域:

生态生态学生态生态学
土壤科学土壤科学
微生物学微生物学

背景情况:

长期放牧显著改变了草原生态系统中的土壤特性和微生物群落.
了解土壤固体测量失衡和微生物碳利用效率 (CUE) 之间的联系对于在放牧环境中的土壤碳动态至关重要.

研究的目的:

调查不同放牧强度对沙漠草原土壤微生物CUE和石化失衡的影响.
探索土壤营养物质的可用性,微生物生物质固态度,酶活动和牧场压力下的CUE之间的关系.

主要方法:

在 *Stipa breviflora* 沙漠草原中,利用了具有不同强度 (重度,中度,轻度和控制) 的长期放牧实验.
测量了土壤可用的营养素,微生物生物质和细胞外酶活动.
使用生态固体测量原理计算土壤微生物CUE,并使用结构方程建模 (SEM) 分析数据.

主要成果:

放牧显著抑制了土壤微生物CUE的1.0%-10.3%.
适度放牧增加了土壤C:N不平衡,而重度放牧显著增加了C:P和N:P不平衡,表明N和P限制.
SEM结果表明,随机失衡通过改变元素随机测量值,微生物生物质随机测量和酶随机测量间接影响微生物CUE.

结论:

牧场诱导的土壤固体测量失衡,特别是N和P限制,会对沙漠草原中的微生物碳利用效率产生负面影响.
土壤微生物群落通过调节元素比率和酶生产来适应静态度失衡.
生态固体测量为了解微生物对放牧的反应及其在土壤碳循环中的作用提供了有价值的框架.

关键词:

细胞外的酶性活动.放牧强度的放牧强度是什么微生物碳使用效率效率.静止学不平衡的原因是

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