求翻译：水土流失不仅使上游的土地肥力下降，生态破坏，而且造成下游河道和水库的淤积、严重影响沿河生产发展和人类生命财产安全是什么意思？

Soil erosion not only to the upper reaches of soil fertility decline, ecological damage, and cause downstream siltation of rivers and reservoirs, seriously affecting the river development and human life and property safety

Soil erosion not only makes the upper soil fertility decline, ecological destruction, and downstream from the river and reservoir sedimentation, severely affected riparian production development and human life and property safety

Not only upstream the soil erosion causes the soil fertility to drop, the ecology destroys, moreover creates the downstream river course and the reservoir siltation, the serious influence produces the development and the humanity life and property security along the river

Land fertility decline not only upstream of soil erosion and ecological damage and cholestasis, severe effects of causing downstream rivers and reservoirs along the production and safety of human life and property

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