Key;
Laboratory;
of;
Soil;
Erosion;
and;
Dryland;
Farming;
on;
the;
Loess;
Plateau;
Northwest;
A&F;
University;
Yangling;
712100;
P.;
R.;
China;
for;
Resources;
Environment;
and;
Food;
Security;
China;
Agricultural;
University;
Beijing;
100193;
P.R.;
China;
Laboratory;
of;
Mountain;
Ecological;
Restoration;
and;
Bioresource;
Utilization;
Chengdu;
Institute;
of;
Biology;
Chinese;
Academy;
of;
Sciences;
Chengdu;
610041;
P.R.;
China;
土壤水分亏缺; 半干旱环境; 玉米生产; 地膜覆盖; 旱作; 半干旱地区; 通用汽车; 作物产量;