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二月兰-春玉米轮作生产体系是近年来为解决华北地区出现的大面积冬闲田而提出的冬绿肥-春玉米生产新模式.本文依托定位试验,研究了该体系从二月兰翻压到玉米收获期间的土壤硝态氮时空变化特征.结果表明:土壤硝态氮含量呈玉米生育前期高后期低的时间变化特征和硝态氮含量峰值随着生育期的推移逐渐下移的空间变化特征,且土壤硝态氮含量随施肥量的增加而显著增加.翻压二月兰对土壤硝态氮含量的时空变化有一定影响,冬春季种植二月兰可降低0~180 cm土壤硝态氮累积量;二月兰翻压后,春玉米苗期与喇叭口期土壤硝态氮规律基本一致,主要集中在0~20 cm土层,0~100 cm土壤剖面为有二月兰处理高于无二月兰处理,100~180 cm土壤剖面则为有二月兰处理低于无二月兰处理;抽雄期以后,土壤硝态氮含量普遍较低,100~180 cm土层土壤硝态氮含量为有二月兰处理略高于无二月兰处理.总体上,翻压二月兰可以增加0~180 cm土层土壤硝态氮保蓄量.
February Lan-spring corn rotation production system is a new mode of winter green manure-spring corn put forward in recent years to solve the large area of winter idyll in northern China.This paper relies on the positioning test to study the system from February Lan pressure to The results showed that the content of nitrate nitrogen in soil was the characteristic of low temporal variation at the later growth stage of maize and the spatial variation characteristics of the peak of nitrate content decreased gradually with the growth period , And the content of nitrate nitrogen in soil increased significantly with the increase of fertilizer application. Transpiration of Pennisetum glauca had a certain effect on the spatial and temporal variation of soil nitrate nitrogen content. The planting of Lancome in winter and spring could reduce the nitrate nitrogen Cumulative amount; After the pressure was applied in February, the regularity of nitrate nitrogen in spring maize seedling was the same as that in trumpet mouth, mainly in 0 ~ 20 cm soil layer, The soil profile of 100-180 cm soil layer was lower than that of the non-meadow soil in 100-180 cm soil layer. The soil nitrate nitrogen content was generally lower in the 100-180 cm soil layer after the tasseling stage, The content is slightly higher in February than the blue treatment Lan month process. In general, blue can be increased plowing February 0 ~ 180 cm soil nitrate retention soil storage.