求翻译：结果表明：近十年来，耕地对沣河流域TN、NH4+-N和TP负荷的非点源贡献率较大，分别占到37.87%，37.74%，15.56%，且呈现上升趋势；农业人口对TN、NH4+-N、TP和COD的贡献率分别是：40.73%，41.06%，61.19%，21.59%，且呈现上升趋势；大牲畜和猪对COD的贡献率分别是：40.90%，32.11%；所以要控制沣河流域的非点源污染，必须要控制耕地和农业人口以及大牲畜所产生的污染负荷。是什么意思？

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Results showed that: in the past 10 years, Sheng Feng to cultivated land, river basin TN N NH 4+ - and TP load of non-point source contribution rates, accounted for 37.87 % and 37.74 % to 15.56 % and rise; the agricultural population, NH TN N , 4+ -COD TP and the rate of contribution are: 40.73 % to

The result indicated that,In the recent ten years, plant crops to feng river basin TN, NH4+-N and the TP load nonpoint source technical progress factor are big, account for 37.87%,37.74%,15.56% separately, also present the trend of escalation; The agricultural population to TN, NH4+-N, TP and the CO

Results show that over the past ten years, cultivated land on the fenghe River TN, NH4+-N and TP load higher rates of non-point source contributions of, respectively, accounting for 37.87%,37.74%,15.56%, and the upward trend; agricultural population of TN, NH4+-N, TP and COD contribution rates are a