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《Journal of Agro-Environment Science》 2008-02
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Effects of Rice Straw Mulching on Soil Temperature and Moisture Regulation in an Upland Red Soil

SU Yan-tao1,3, WANG Kai-rong1,2, LIU Ying-xin1,3, XIE Xiao-li1 (1.Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; 2.Institute of Agriculture Ecological and Environmental Health, Qingdao Agricultural University, Qingdao 266109, China; 3.Graduate School of Chinese Academy of Sciences, Beijing 100039, China)  
Based on a field plot experiment of rainfed summer maize, the influences of rice straw mulching on soil temperature, moisture dynamics and reducing drought stress effects of the maize plants were studied in a upland soil derived from the Quaternary red clay earth. Straw mulching could reduce soil temperature significantly within the 10 cm top layer in the high air temperature period (15:00). The extent of reduction ranged from 1.6 ℃ to 4.1 ℃ averagely, and the effect of temperature reduction was enlarged with the amount of rice straw mulching increasing. There was also a measurable increase of water holding capacity at the 0~5 cm soil layer in treatments with straw mulching. In the high air temperature and drought period, the lowest content of soil moisture in the 0~5 cm layer increased by 3.3%~3.6% averagely when 5 000~10 000 kg·hm-2 of rice straw was mulched, while the moisture content increased by 6.1% when amount of straw mulching increased to 15 000 kg·hm-2 averagely. Because of the effects of straw mulching on decreasing soil temperature and increasing water hold capacity, the photosynthesis rate of the maize plants increased by 4.46~11.27 μmol·m-2·s-1 (i.e. 16.3%~41.3%) at the elongation stage, and 4.46~11.27 μmol·m-2·s-1 (i.e. 16.3%~41.3%) at the female flower initiation stage, compared with the non-mulching control. And the grain yield increased by 7.6%~13.1% with straw mulching. Considering the acceptable effects on reducing soil temperature and protecting soil moisture, a dose less or more than 5 000 kg·hm-2 of rice straw could be chosen as mulching of upland soil in the subtropical hilly area of Hunan province.
【Fund】: 中国科学院知识创新工程(KZCX3-SW-441);; 国际合作IRRI/BMZ/GTZ联合资助项目
【CateGory Index】: S152
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