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Soil salinization and ecological remediation by planting trees in China

土壤盐分 环境科学 土壤水分 盐度 农学 土地复垦 恢复生态学 播种 中国 农业土壤学 地下水 碱土 内涝(考古学) 浸出模型 土壤肥力 农林复合经营 土壤生物多样性 环境修复
作者
Jianfeng Zhang,Jingmin Jiang,Qihua Shan,Guangcai Chen,Ying Wang,Liming Shen,Pan Chunxia,Harry X. Wu,Aljoy Abarquez
出处
期刊:International Conference on Mechanic Automation and Control Engineering 卷期号:: 1349-1352 被引量:6
标识
DOI:10.1109/mace.2010.5536279
摘要

With world population growth, the demand for food, vegetable and so on is increasing. However, arable land area cannot expand. Moreover it would decrease owing to land use change with socio-economic development. Especially in China that is the most populated country in the world, while its cultivated land area could not match with the population, farmland is gradually declining with urbanization progress. In order to meet the demand to grain production and alleviate the pressure on current arable land, wasteland must be reclaimed. Forestation is not only one way for saline-alkali soil utilization, but also can improve soil property and maintain ecological balance. Salt-affected soils extensively distribute on the earth. Although the causes are various for salinization occurrence, generally spoken it results from the accumulation of free salts to an extent that causes degradation of vegetation and soils. On the other hand, irrational human practices have increased soil salinity by changing the natural balance of the water cycle in the landscape by allowing excess recharging of groundwater. This reduces suitability to plant growth and increases the potential for other forms of land degradation such as soil erosion and structural decline. Thus salinization is one of the most serious long-term threats to the sustainability of land and water resources in the world. Trees can tolerant a certain level of salinity thanks of the nature. Therefore in the viewpoint of biological amelioration of salt-affected soil, planting trees is necessary and significant. After trees are established in saline land, the watertable could be declined through increasing discharge and decreasing recharge. Additionally total salt content could be decreased, especially in soil surface profile and topsoil as well as soil physical & chemical state could be ameliorated.
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