论文部分内容阅读
氮素是蛋白质的基本成份,高等植物组织平均含有氮素2-4%。植物从土壤吸收的养分中,以氮素为最多。当土壤缺氮时,植物碳素同化能力降低,生长明显受抑,并提前衰老。而且,充足的氮素还可提高植物对磷、钾、钙的吸收。但过多的氮素会降低植物的抗逆性。因此,土壤的氮素供应状况,对于林木生长至关重要。所以,研究土壤氮素供应,对林业生产具有重要的意义。众所周知,土壤的氮素供应,决定于土壤有机质的积累与分解的状况。然而,到目前为止,还未见到这方面的实证。本文根据林业区划中的土壤调查资料,对土壤有机质与氮素供应的相关关系进行了探讨。
Nitrogen is the basic component of protein, higher plant tissue contains an average of 2-4% of nitrogen. Of the nutrients that plants absorb from the soil, nitrogen is the most abundant. When soil nitrogen deficiency, plant carbon assimilation decreased, growth was significantly inhibited, and premature aging. Moreover, adequate nitrogen can also increase the plant’s absorption of phosphorus, potassium and calcium. However, too much nitrogen will reduce plant stress resistance. Therefore, the availability of nitrogen in the soil is crucial to forest growth. Therefore, studying soil nitrogen supply is of great significance to forestry production. It is well-known that soil nitrogen supply depends on the accumulation and decomposition of soil organic matter. However, so far, no evidence of this has been seen. In this paper, according to soil survey data in the forest zoning, the relationship between soil organic matter and nitrogen supply was discussed.