Published: Feb. 1, 2024

Abstract. Nitrogen (N) fertilization has received worldwide attention due to its benefits soil fertility and productivity, but excess N application also causes an array of ecosystem dis-services, such as greenhouse gas emissions. Generally, microorganisms are considered be involved in upholding a variety services dis-services. However, the linkages between microbial traits under different fertilizer rates remain uncertain. To address this, 4-year situ field experiment was conducted meadow on Northeast China Plain after straw return with following treatments combined regular phosphorus (P) potassium (K) fertilization: (i) (N+PK); (ii) 25 % reduction (0.75N+PK); (iii) 50 (0.5N+PK); (IV) no (PK). Ecosystem services, dis-services responded distinctly rates. Treatment 0.75N+PK had overall positive effects fertility, decomposition, abundance function alleviated deficiency. Meanwhile, upregulated aboveground biomass C:N thus increased genes encoding cellulose-degrading enzymes, which may imply potential ability C turnover. In addition, most observed changes were strongly associated modules keystone taxa. Specifically, Lasiosphaeriaceae-driven module 1 community promoted degradation release, while Terrimonas-driven 3 contributed production improvement, conducive multifunctionality. Therefore, our results suggest that chemical is optimal for achieving services. This study highlights importance abiotic biotic factors health supports green agricultural development by optimizing return.

Language: Английский