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《Acta Pedologica Sinica》 2013-06
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Zhao Yonggan;Li Yuyi;Hu Xiaolong;Wang Jing;Pang Huancheng;Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences& Key Laboratory of Non-point Source Pollution Control,Ministry of Agriculture;Department of Resource and Environmental,College of Agronomy,Shihezi University& Key Laboratory of Oasis Ecological Agriculture,Xinjiang Production and Construction Corps;  
In order to explore effects of tillage on dynamics of soil water and salt in saline-alkali soils in the Hetao Irrigation District in Inner Mongolia,a micro-plot field experiment,designed to have four treatments,i. e. Treatment T(tillage),Treatment P(plastic mulching),Treatment S(deep burial of straw) and Treatment P + S(plastic mulching plus straw burial),was conducted over a whole sunflower growing period. Results show that Treatment P + S not only significantly enhanced water storage capacity of the 0 ~ 40 cm soil layer,but also continuously preserve soil moisture. Soil water content of the 0 ~ 40 cm soil layer was 5. 13%,3. 49% and 1. 99% higher in Treatment P + S than in Treatments T,P and S before sowing,respectively. Compared to Treatment T,P and S,Treatment P + S increased water content of the soil layer by 5. 01%,5. 87% and 2. 70%,respectively,at the early growing period,and by 7. 53%,11. 02% and6. 16%,respectively,at the medium growing period. Moreover,Treatment P + S displayed significant long-term effect of suppressing and controlling soil salt in the soil layer. Soil salt content was 18. 37%,20. 33% and 1. 90% lower in Treatment P + S than Treatment T,P and S before sowing,respectively,45. 46%,37. 63% and 39. 67% lower in the early growing period,17. 89%,29. 77% and 37. 22% lower in the middle growing period,and 14. 46%,13. 90% and19. 88% in the later growing period,respectively. In addition,Treatment P + S significantly reduced salt accumulation per unit volume of soil,showing a significant effect of desalinizing the soil,particularly the plough layer. The above findings suggest that Treatment P + S is an optimal option to regulate and optimize the distribution of soil water and salt,and create a suitable soil environment for better growing of sunflower.
【Fund】: 国家自然科学基金项目(31000692);; 公益性行业(农业)科研专项经费项目(200903001);; 中央级公益性科研院所基本科研业务费专项资金项目(2012ZL031)资助
【CateGory Index】: S152.7
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