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了解保护性耕作如何促进土壤碳积累:洞察细胞外酶活动和总分数之间的碳流

Xiaotong Liu¹, Xiaojun Song², Shengping Li²

¹State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China; Key Laboratory of National Forestry and Grassland Administration/Beijing for Bamboo & Rattan Science and Technology, Institute of Resources and Environment, International Centre for Bamboo and Rattan, Beijing 100102, PR China.

The Science of the total environment

|July 10, 2023

概括

保护性耕作,如无耕作 (NT) 和用草覆盖 (SS) 进行地下耕作,通过改善土壤结构和减少酶活性来增强土壤有机碳 (SOC) 积累. 这些方法保护土壤中较大的碳聚合物,促进气候变化减缓.

科学领域:

土壤科学土壤科学
农业生态学农业生态学
环境科学环境科学

背景情况:

保护性耕作实践对于通过土壤碳捕获来缓解气候变化至关重要.
对于保护性耕作如何在土壤总量尺度上特别增强土壤有机碳 (SOC) 积累的理解有限.

研究的目的:

通过检查土壤聚合物中的酶活动和碳矿化,研究保护性耕作对SOC积累的影响.
使用自然13C丰度 (δ13C) 方法,阐明聚合物分数之间的碳流动力学.

主要方法:

在中国进行了为期21年的耕作实验,对表层土壤进行了分析.
测量水解和氧化酶活性和C矿化在不同的土壤聚合物分数.
应用13C自然丰度 (δ13C) 方法来建模聚合物之间的C流.

主要成果:

与传统耕地 (CT) 和减少耕地 (RT) 相比,无耕地 (NT) 和用草覆盖 (SS) 的地下土壤显著增加了宏观聚合物比例和SOC含量.
在所有土壤部分中,NT和SS处理表现出较低的SOC矿化和关键水解和氧化酶活动的减少.
在NT和SS下观察到从宏积分到微积分的C流量减少,这表明宏积分内的年轻SOC的保护得到了增强.

结论:

保护性耕作实践,特别是NT和SS,有效地促进SOC在宏观聚合物中的积累.
这些做法通过降低酶活性和限制聚合物大小之间的C转移来增强SOC封存.
该研究提供了对保护性耕作下的土壤碳积累的机制性见解,有助于预测其对减缓气候变化的有效性.

关键词:

(13) C自然丰富的自然丰富性碳矿物化的碳矿化.碳路径的碳路径.碳稳定碳稳定水溶酶和氧化酶的存在.宏观聚合物的保护.

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