The final major human cause of desertification is soil salinization resulting from overirrigation.
造成土地沙漠化的最后一个主要人为因素在于人类过度灌溉导致土壤的盐碱化。
2
Four specific activities have been identified as major contributors to the desertification processes: overcultivation, overgrazing, firewood gathering, and overirrigation.
导致沙漠化的主要因素有四个：过度种植，过度放牧，过分砍伐，过度灌溉。
3
Over the last 40 years, only 4 million hectares of new irrigation have been developed, compared to 25 and 32 million hectares for China and India respectively.