在西北雨养旱作地区，地膜春玉米后期早衰现象普遍，严重制约玉米籽粒产量形成。明确玉米早衰形成原因，对促进该区地膜玉米增产增效具有重要作用。目前，有关地膜玉米的土壤温度调控技术及作用机理研究较少，土壤温度改变后玉米根系对水分和养分吸收利用的内在机制仍不清楚，不同土壤温度变化下的土壤水分运动与吸收利用规律有待深入探究。本研究以地膜对土壤的增温作用为切入点，采取有效的地膜调温措施，研究增温对土壤理化性状、玉米根冠发育及衰老关键酶活性等的影响。揭示地膜增温下玉米根冠衰老形态特征和内源激素变化规律；明确地膜增温与土壤环境、土壤环境与玉米根系发育及内源激素分泌、根系发育与叶片形态及内部活性等之间的互作关系。从土壤环境和根冠生理代谢两个方面，系统阐明地膜增温对土壤环境和玉米根冠衰老的作用机理，探寻玉米防衰增产的新途径和新方法。

In the rainfed area of northwest of China, the phenomenon of premature senescence had a serious impact on the formation of grain yield of maize which film mulch maize grow on late stage. Clear maize senescence causes, it plays an important role in promoting high yield and efficiency of film maize. At present, the study of soil temperature control technology and mechanism on film mulch maize was litter, and the mechanism of water and nutrient in soil absorbed and utilized by maize root was still not clear under change of soil temperature. The principle of soil water movement and absorption under different soil temperature needed to be further explored. In this study, the effect of film mulching on soil warming was taken as the breakthrough point, using effective measures to adjust film temperature, studying on effect of temperature on soil physicochemical properties, root growth and aging of key enzyme activity of maize. Reveal morphological characteristics and changes of endogenous hormones of maize root and leaf aging under film warming. The relationship between the plastic film warming and soil environment, the soil environment and the development of maize root system, the secretion of endogenous hormones, the development of root system and morphology and internal activity of leaves were studied. From two aspects of soil environment and root physiological metabolism, to clarify the mechanism of film temperature on soil environment and corn root leaf aging, and seek to a new way and method of increasing yield and prevention sensecence for of maize.