论文部分内容阅读
加拿大对造成资源衰减的农业活动进行了一项短期的、辅助性的试验研究。近一百年来, 加拿大农业用地少,气候又不稳定,致使资源衰减成为一个较为严重的问题。在20世纪30年代,发生了严重的干旱,加上不合理的农业耕作活动,发生了严重的侵蚀现象。到80年代再次发生了严重的干旱。影响资源衰减的因素不断增加,它们与有机物的消耗、风蚀、水蚀和盐浓度增大有关。
Canada conducted a short-term, complementary pilot study of agricultural activities that caused a decay in resources. In the recent one hundred years, Canada has less agricultural land and its climate is unstable. As a result, the decline of resources has become a serious problem. In the 1930s, a serious drought occurred, coupled with unreasonable agricultural practices and serious erosion. By the 1980s there was a serious drought again. The factors that affect the attenuation of resources are increasing, and they are related to the consumption of organic matter, wind erosion, water erosion and salt concentration.