The spatial distributing changes of land use showed that the farmland was mainly converted to forestland, grassland and orchard.
从空间分布变化来看，主要表现为耕地向林地、草地及园地转变。
Compared with traditional uncovered farmland, a greenhouse region changes the runoff, erosion, and affects generation of nonpoint source pollutants.
相对于传统的露天种植，塑料大棚改变了降雨径流和土壤侵蚀过程，进而影响面源污染物的产生。
Water system changes, reclaiming farmland from lakes, etc, made a serious threat to flood and waterlogging control.
水系格局改变、围湖造田等这对于防洪除涝造成严重威胁。
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