heavy gradient 中文意思是什麼
heavy gradient
解釋
大梯度-
Ecocline a cline that is due to a specific environmental factor, such as a gradient of heavy metal concentration in the soil
生態漸變群：由物種生存特定環境因素影響而形成的一種漸變群，例如土壤中的重金屬濃度梯度。 -
In our country, many railway lines which were built in mountainous area have heavy gradient and curves with small radius. so it is difficult to improve them and a great amount of cost is needed in the modification of them
由於我國幅員遼闊，有相當多的鐵路處于山區，線路坡度大、曲線半徑小、建設標準低，如果按照三大幹線標準改造線路使之適應提速要求，鐵路的改建很困難，所需人力物力不亞于修建新鐵路，不適合我國目前的國情。 -
The paper studied three aspects of extracelluar enzymes in sediments of the tidal flat wetland, namely 1 ) the distibution of five sorts of extracellular enzymes in sediments in the east end of chongming island along the elevation gradient or community succession series, the relationships between the activities of enzymes and the ecological factors, and functions of extracellular enzymes in the process of community succession ; 2 ) the effects of the heavy metal ions and edta on the activity of alkaline phosphatase in sediments of the east end of chongming island by adding and removing of heavy metal ions, discussing whether the activities of extracellular enzymes could be taken as the indicators for the environmental status ; 3 ) the variations of the activities of extracellular enzymes in sediments in the east end of hengsha island after the discarding clay
本文以長江口典型濕地?崇明東灘為例，首次研究了沿高程梯度或沿植被演替系列沉積物中堿性磷酸酶等五種胞外酶活性的空間分佈規律，分析了胞外酶活性與環境因子的相互關系及其產生機制，討論了胞外酶活性在濕地植被演替中的作用。同時以崇明東灘沉積物為對象，運用重金屬離子的添加和去除等方法，研究了重金屬離子對沉積物中堿性磷酸酶活性的影響，利用胞外酶活性的變化探討了崇明東灘重金屬污染的狀況。此外，本文還研究了橫沙東灘吹泥試驗工程對沉積物環境因子和胞外酶活性的影響並進行了對比分析。 -
In our country, many railway lines which were built in mountainous area have heavy gradient and curves with small radius
由於歷史的原因，我國大部分既有線路，特別是中、西部的既有線路等級不高，基礎條件差。
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