秸秆还田配施氮肥对稻田土壤活性碳氮动态变化的影响

王士超,闫志浩,王瑾瑜,槐圣昌,武红亮,邢婷婷,叶洪龄,卢昌艾

Nitrogen Fertilizer and Its Combination with Straw Affect Soil Labile Carbon and Nitrogen Fractions in Paddy Fields

ShiChao WANG,ZhiHao YAN,JinYu WANG,ShengChang HUAI,HongLiang WU,TingTing XING,HongLing YE,ChangAi LU

表1 水稻田间试验处理及肥料用量

Table 1 Treatments and fertilizer application rate in field experiment

试验 Experiment 处理 Treatment 基肥 Basal fertilizers（kg·hm-2） 追肥 Top-dressed nitrogen (kg·hm-2) N P2O5 K2O 秸秆 Straw 菌剂 Microbial inoculants 秸秆配施氮肥 Straw incorporation combined with nitrogen fertilization 小麦秸秆移除 Wheat straw removal (CK) 195 60 90 0 0 0 小麦秸秆全量还田 Wheat straw incorporation (S) 0 60 90 4500 0 0 全量秸秆+习惯施氮量 Straw incorporation matched with farmer common N rate (SN) 136.5 60 90 4500 0 58.5 全量秸秆+推荐施氮量 Straw incorporation matched with optimal N rate (SF) 115.5 60 90 4500 0 49.5 全量秸秆+推荐施氮量+腐熟菌剂 SF plus straw decomposing microbial inoculants (SM) 115.5 60 90 4500 30 49.5 氮肥用量 Nitrogen rate 不施氮肥 No nitrogen fertilizer (N0) 0 60 90 4500 0 0 总施氮量为165 kg·hm-2 Optimal nitrogen fertilizer (N165) 115.5 60 90 4500 0 49.5 总施氮量为195 kg·hm-2 Farmer common nitrogen rate (N195) 136.5 60 90 4500 0 58.5 氮肥基追比 Basal/topdressing ratio of nitrogen fertilizer 小麦秸秆全量还田,基施：拔节期：抽穗期氮肥施用比例为7﹕3﹕0 Basal/topdressing ratios of nitrogen fertilizers in the shooting and heading stage: 7﹕3﹕0 (R1) 115.5 60 90 4500 0 49.5 小麦秸秆全量还田,基施：拔节期：抽穗期氮肥施用比例为5﹕3﹕2 R2 Basal/topdressing ratios of nitrogen fertilizers in the shooting and heading stage: 5﹕3﹕2 (R2) 82.5 60 90 4500 0 82.5 小麦秸秆全量还田,基施：拔节期：抽穗期氮肥施用比例为10﹕0﹕0 R3 Basal/topdressing ratios of nitrogen fertilizers in the shooting and heading stage: 10﹕0﹕0 (R3) 165 60 90 4500 0 0