chemical deterioration 中文意思是什麼
chemical deterioration
解釋
化學變質- chemical : adj 化學的，化學作用的；應用化學的，用化學方法獲得的。n 〈常 pl 〉化學製品；藥品。 fine chemicals...
- deterioration : n. 1. 惡化；變質；退化。2. 墮落，頹廢。3. 凋萎；衰敗。adj. -tive
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The brown colouration was found to be a result of some chemical deterioration, which happened on the cellulose fibre of the paper substrate, due to its previous unfavourable storage condition
污斑是由於紙本的纖維老化而產生的這與該批版畫在未收作館藏前放置在不適當的貯存環境有關。 -
As the agricultural nfs is the most important factor for water environmental deterioration and lake eutrophication in china, more and more scientists and technologists focus on the control countermeasurc and pollution mechanism of agricultural non - point source ( nfs ). based on the investigation of natural resource and agricultural distribution, the loss rule of nitrogen and phosphorus in the typical land of qiandao lake watershed and distribution rule of the phytoplankton and physico - chemical characteristic in the lake were studied, and the input loading of nitrogen and phosphorus was also calculated by the annagnps model in this thesis. according to the routine monitoring data of the water environment in qiandao lake from 1989 to 2001, the concentrations of toxic substance and heavy metal were under the monitoring limit, but the total nitrogen ( tn ) and total phosphorus ( tp ) were much higher than the criterion for lake and reservoir
本文調查了千島湖流域的自然資源和農業生產情況，研究了典型坡地降雨徑流中的氮、磷污染物的輸出規律，利用annagnps模型估算流域農業非點源污染物輸入負荷，並在千島湖內設點采樣，對水質理化指標和浮游植物群落進行系統的研究，得出以下結論： 1989 2001年間的水環境常規監測資料統計分析表明，有毒物質和重金屬濃度長期在監測下限內， no _ 2 - n 、 no _ 3 - n 、 nh _ 3 - n年平均濃度均符合類標準，但湖泊水庫特定項目tn和tp濃度分別為超類和類，呈嚴重超標狀況，湖區主要污染因子是將導致富營養化的物質tn和tp 。 -
Agricultural intensification plays an important role in stabilizing the food production in china, while bringing about an increasing negative impact on the soil and eco - environment as a result of the long - term highly - intensive land use and agricultural chemical overuse, thus leading to degradation of soil physical, chemical and biological properties, which are demonstrated as soil nutrient imbalance, soil acidification, pollutant accumulation, and biodiversity deterioration and posing serious stress and threat to the ecosystem per se and the environment
摘要集約化農業對保障我國糧食安全發揮了巨大的作用，但其長期的土地高強度利用和農用化學品過量投入的負面影響也日益顯現，導致的以土壤養分失衡、土壤酸化、有害物質積累、生物多樣性衰退等為主要表現形式的土壤物理、化學和生物學退化，給生態系統本身與環境都帶來了巨大壓力和嚴重威脅。
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