水保所知识产出(1956---)知识库

 以旱作雨养条件下的春玉米为试验对象，在长武黄土高原农业生态试验站进行田间 试验，研究了地膜覆盖和施氮量对农田净温室效应和温室气体排放强度的影响．结果表明: 采 用地膜覆盖与增加施氮量都会影响净温室效应与温室气体排放强度，地膜覆盖条件下( FM) ， 不同施氮量的春玉米产量为 1643 ～ 16699 kg·hm－2，净温室效应( CO2 当量，下同) 为 595 ～ 4376 kg·hm－2·a－1，温室气体排放强度为213～358 kg·t－1; 无覆膜条件下( UM) ，不同施氮量 的春玉米产量为 956～8821 kg·hm－2，净温室效应为 342～4004 kg·hm－2·a－1，温室气体排放 强度为 204～520 kg·t－1．研究表明，对于旱作春玉米农田系统，地膜覆盖可以有效降低温室气 体排放强度，增加作物产量，地膜覆盖下施氮 250 kg·hm－2可以实现高产与降低环境代价的 双赢．

 A one-year field experiment was conducted to evaluate the effects of plastic film mulching ( FM) and nitrogen application rates applied to rain-fed maize fields on net global warming potential ( Net GWP) and greenhouse gas intensity ( GHGI) at the Changwu Agricultural and Ecological Experimental Station． Both GWP and GHGI were affected by the plastic film mulching and nitrogen application rate． Under the FM treatment，maize yield ranged from 1643 to 16699 kg·hm－2，the net GWP ( CO2-eq) ranged from 595 to 4376 kg·hm－2 ·a－1，and the GHGI ( CO2-eq) ranged from 213 to 358 kg·t－1． The grain yield of maize，net GWP and GHGI for the UM ( no mulching) treatment were 956 to 8821 kg·hm－2，342 to 4004kg·hm－2·a－1and 204 to 520 kg·t－1，respectively． The results suggested that plastic film mulching could simultaneously improve grain yield and decrease GHGI in rain-fed cropland along with nitrogen fertilizer of 250 kg·hm－2．