微地貌对川中丘陵区紫色土和作物的影响

INFLUENCE OF MICROTOPOGRAPHY TO PURPLE SOIL AND CROP IN MID-SICHUAN HILLY REGION

由紫色砂泥岩组成的川中丘陵区,微地貌是影响紫色土的光热水肥及其动态的重要因素,对土壤性质和作物产量的影响明显.

Taking it for an example the district of purple sand and shale rocks of Penglaizhen Group, Jurassic situated at Penmiao Village, Zhenjin Township, Jianyang City, Sichuan Province, the influences of 3 types of microtopographic features including the top,middle and bottom of hill on the distribution,erosion,thickness,gravel content,wetness and temperature of purple soils,on crop overall arrangement and on the yields of wheat, cotton, sweat potatoes have been discussed. The research results showed that the microtopographic features were indeed the important factors affecting the dynamic of light, heat, water and fertility. The microtopographic features play a major role in the soil formation, distribution, erosion deposit, physicochemical proprieties, agricultural production feature and soil fertility,and thus affecting crop growth and yields. In the process of agricultural production practice the microtopographic features should be utilized and remoulded with local conditions so as to give the reins to the productive pocential of soils.