生物炭施用方式对黑土和潮棕壤养分及氮磷转化相关酶活性的影响

为探明不同生物炭施用方式对农田土壤养分含量及元素转化的影响,通过设置在黑土和潮棕壤的两个为期5年的田间定位试验,研究每年低量施用(AL,22.5 t· hm-2·a-1)和间隔性高量施用(IH,112.5 t·hm-2·5 a-1)玉米秸秆生物炭对土壤碳、氮、磷含量,土壤生物学性质及氮磷转化相关酶活性的影响,以期为秸秆...

Effects of biochar application patterns on soil nutrients and nitrogen- and phosphorus-related enzyme activities in Phaeozem and Luvisol

We investigated the effects of different biochar application patterns on soil nutrient contents and element transformation, with soil samples being collected from two five-year field experiments in Phaeozem and Luvisol amended with biochar at annual low-rate (AL, 22.5 t·hm^-2·a^-1) and intervalic high-rate (IH, 112.5 t·hm^-2·5 a^-1). Changes of soil total carbon (C), nitrogen (N) and phosphorus (P) contents as well as the related enzyme activities were measured under different biochar application patterns to provide fundamental information for the straw utilization and soil fertility improvement in agroecosystem. Results showed that total C and organic N contents in AL treatment were significantly higher than those in IH treatment in Phaeozem soil. Compared with the control, the decreases of dehydrogenase activity in AL treatment was more pronounced than that in IH treatment in Phaeozem soil, and the increases of protease activity in IH treatment was pronounced than that in AL treatment in Luvisol. Compared with Luvisol soil, the application of biochar had stronger effect on total soil C and organic N contents in Phaeozem soil. Application of biochar significantly increased the activities of soil dehydrogenase and protease in Luvisol soil, but decreased the activity of soil dehydrogenase. Soil types and biochar application patterns interacted to affect soil C and N contents, microbial metabolic activity, N- and P-related enzyme activities. In summary, soil types and biochar addition affected soil properties and microbial characteristics, which would provide important information for straw application and soil management.