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我们于冬季对华盛顿州西部海岸和俄勒冈州西北部喀斯喀特山脉两地区的八个天然林分里的20—30令老加州铁杉树(Tsuga hetcrophylla)的立地指数,生长量和叶内主要的大量元素、微量元素、铝以及叶绿素等的含量作了调查。50令铁杉的立地指数为22—29米。最大生长量、针叶内大多数营养元素及叶绿素的浓度,在八个立地之间和两个地区之间都不相同。立地指数与最大生长量、全氮、叶绿素‘a’、总叶绿素以及含铁量成正相关:而与锰和硫酸盐一硫成负相关。结果表明,海岸立地上针叶内某些主要营养元素含量低则是所报导的海岸铁杉林氮肥未获普遍成功的主因。加州铁杉立地生产能力可以通过经常增加针叶内的氮素、叶绿素和铁含量的栽培方法,获得改善。含有一种或一种以上这些成分的叶子,作为估计铁杉立地质的指示物,则可能是很有用的。此外,叶绿素还可以估计铁杉林内氮素状况。
The site index, growth and abundance of Tsuga hetcrophylla from 20-30 in winter in eight natural forests in the western coast of Washington State and the Cascade Mountains northwest of Oregon The major elements, trace elements, aluminum and chlorophyll content were investigated. 50 to hemlock site index of 22-29 meters. The maximum amount of growth, the concentration of most nutrients and chlorophyll in the needles is different between the eight sites and between the two areas. Site index was positively correlated with maximum growth, total nitrogen, chlorophyll a ’, total chlorophyll and iron content, but negatively with manganese and sulfate monosulfate. The results showed that the low content of some of the major nutrient elements in the needles on the coastline was the main reason for the unsuccessful success of reported nitrogenous fertilizer on the hemlock coast. On-site productivity of Hemlock’s heather can be improved by cultivation practices that often increase nitrogen, chlorophyll, and iron content in the needles. Leaves containing one or more of these ingredients may be useful as an indicator of the hematite formation. In addition, chlorophyll can also estimate the status of nitrogen in the hemlock forest.