摘要
松嫩平原为我国高产粮区,但其西部由于沙化、盐碱化日趋加重而减产明显。本文以松嫩平原西部为研究区,运用DNDC模型对其进行了2015年表层土壤有机碳及作物产量的模拟,并对不同气候情景下研究区土壤有机碳储量变化和作物产量进行了模拟。研究表明:松嫩平原西部表层土壤中有机碳总约为储量7794.42万t,其变化均值为-225.18kg C·ha^(-1),研究区为"碳源";研究区作物产量均值为3576.167kg C·ha^(-1),实际作物产量约为8.94t·ha^(-1),总产量约为3429.83t。研究区表层土壤有机碳储量和作物产量在空间分布上均表现为由西北向西南、东南递减的趋势。温度的升高、降水的增多,都会造成研究区内土壤有机碳储量减少;空气中CO_2浓度升高,土壤有机碳储量则会增加。温度升高、降水增加、空气中CO_2浓度升高,均会造成研究区作物减产。
Songnen Plain as high-yield grain area in China？but the West yield reduction significantly due to desertification salinization in recent years. In this study, the study area is in the Western of Songnen Plain, the DNDC model is used to simulate the 2015 surface soil organic carbon and crop yield of study area. Next, the changes of soil organic carbon storage and crop yield were simulated under different climate scenarios. Research shows that： The total reserves of organic carbon about 7794.42×10^4t in the Western Songnen plain surface soil, and the change of mean value is -225.18 kgC · ha^-1. The average crop yield was 3576.167 kg· ha^-1, the actual crop yield was about 8.94t · ha^-1,and the total yield was about 3429.83t in the study area. The surface soil organic carbon storage and crop yield in the study area were all showed the trend of decreasing from northwest to southwest and Southeast. The increase of temperature and precipitation will result in the decrease of soil organic carbon storage in the study area, and the increase of CO 2 concentration in the air will cause the increase of soil organic carbon storage. However, the crop yield in the study area decreased with the increase of temperature, precipitation and CO2 concentration in air.
出处
《环境与发展》
2017年第2期31-36,共6页
Environment & Development
基金
国家自然科学基金面上项目(41571199)
国家自然科学基金青年项目(41401589)
黑龙江省自然科学基金重点项目(ZD201308)
黑龙江省自然科学基金面上项目(D201408)
