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在温带草原中,不同的和度值为上方,下方和总净初级生产率

Guo-Jiao Yang^1,2, Carly Stevens³, Zi-Jia Zhang⁴

¹Erguna Forest-Steppe Ecotone Research Station, CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.

Global change biology

|June 2, 2023

概括

(N) 添加增加了地面上方的净初级生产率 (NPP),但在温带草原下降低了地下NPP. 高含量可能导致和,高估了生态系统的碳捕获效益.

科学领域:

生态生态学生态生态学
生态系统科学生态系统科学
生物地质化学生物地质化学

背景情况:

了解 (N) 沉积对生态系统碳捕获的影响至关重要.
地下净初级生产率 (BNPP) 对缩的反应在很大程度上是未知的.
这限制了在N的可用性增加的情况下准确的碳循环预测.

研究的目的:

调查广泛的N添加梯度对地表核电站 (ANPP),BNPP和总核电站的影响.
为了确定ANPP和NPP在温带草原草原中的和度值.
评估土壤缩在推动BNPP反应和和度方面的作用.

主要方法:

实地实验使用5年的N添加率为0,2,5,10,20和50gNm-2年−1.1.
在N加值梯度上测量ANPP,BNPP和总NPP.
非线性回归分析以确定N和值 (T_A和T_N).

主要成果:

无论是ANPP还是NPP总量,都以非线性增长的方式增加了N.
对ANPP (T_A) 的和值被确定为13.11 g N m−2 年−1 和NPP (T_N) 的6.70 g N m−2 年−1 .
在N添加率>5gNm-2年-1时,BNPP显著下降,导致T_N低于T_A.

结论:

土壤缩对温带草原中高添加率的BNPP产生负面影响.
高度会加速和,可能会高估碳捕获的好处.
同时考虑ANPP和BNPP对于准确评估沉积对初级生产力的影响至关重要.

关键词:

N 的和值值.氨的毒性氨的毒性的沉积是的沉积.在生产生产生产生产生产生产.一个半干旱的草原.土壤中的N度 N度

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