干旱地区农业研究2011，Vol.29Issue(5)：26-32,7.
覆膜方式对旱作玉米硝态氮时空动态及氮素利用效率的影响
Effects of mulching patterns on spatio-temporal variation of soil nitrate and nitrogen utilization efficiency of maize on dry land
摘要
Abstract
A Held experiment in Iijiabu, Dingxi City of Gansu province, was carried out based on improving nitro gen use efficiency and reducing the pollution of nitrogen fertilizer. Four treatments, namely flat-planting with no mulching (NM), half-mulching and flat-planting(HM) , complete-mulching and flat-planting(CM), completely mulched alternat ing narrow and wide ridges with furrow planting(CMRF), were designed to study accumulation of residual NO3- - N and dynamic accumulation and distribution of dry matter and nitrogen use efficiency. The results showed that in the whole growth period of mulching treatments NO3 - N content of 0 ~ 10 cm soil layer was highest and were significantly higher than that of NM, indicating there existed NO3 - N surface accumulation in mulching treatments. NO3 - N content of ' all treatments under 140 cm soil layer was accumulated. The average nitrogen accumulation in the whole growth period was: CMRF > CM > HM > NM. Compared with CM and NM, grain nitrogen accumulation of CMRF was increased by 20.48% and 87.87% , showing that CMRF significantly enhanced plants nitrogen utilization from soil, as well as transport of nitrogen to grain Biomass yield of CMRF was 37.60 % higher than that of HM, maize yield was increased by 49.84% , and nitrogen harvest index was significantly increased by 22.55% compared with HM. During different treatments nitrogen use efficiency of maize was significantly different at 0.05 level, CMRF was significantly increased by 53.98% than NM.关键词
地膜覆盖/黄土高原/硝态氮/氮素利用效率/玉米Key words
Mulching/ Loess plateau/ Nitrate/ Nitrogen use efficiency/ Maize分类
农业科技引用本文复制引用
张仙梅,黄高宝,李玲玲,谢军红,陈红..覆膜方式对旱作玉米硝态氮时空动态及氮素利用效率的影响[J].干旱地区农业研究,2011,29(5):26-32,7.基金项目
十一五国家科技支撑计划(2006BAD15B06) （2006BAD15B06）
国家自然科学基金(40771132) （40771132）
