摘要
本文研究了海河流域主要植物（包括栽培和野生植物）及土壤中氮、碳的含量特征，结果表明：本区植物氮含量平均约２％，最高约６％，少数植物约３％－４％；不同植物类型氮含量以蔬菜植物最高，苔藓、蕨类植物最低。大多数植物碳含量平均在４０％－４５％左右，属正常水平；不同类型植物碳含量以常绿针叶乔木最高，蔬菜作物最低。作物不同部位氮、碳含量都有一定差异，作物含氮量一般为根低于茎、叶和果。作物碳含量一般以果实含量较高，其次为茎和叶。不同土壤类型含氮量以亚高山草甸土最高，盐碱土最低，０－１０ｃｍ土层含氮量明显高于１０一２０ｃｍ土层。不同土类碳含量以棕壤土最高，草甸褐土、潮土最低，土壤含碳量明显低于植物含碳量。大多数土壤有机质含量与氮、碳含量呈显著相关。利用程度越高，有机质含量越低。海河６个子流域中土壤氮、碳含量的水平分布特征，都以滹沦河流域的氮和碳含量最高，永定河流域含氮量最低，大清河流域土壤的含碳量最低，滹沱河流域的氮、碳含量地域分异较明显，其余各子流域的氮、碳含量差异都不显著。
he contents of nitrogen and carbon in plants,including cultivated and wild plants, and soils in the Haihe River Basin were characterized. It was found that the plants growing in thisarea had an average N content of about 2%with a maximum of about 6%,and few species ofthem had an average N content of 3%─4%。Different types of plant might have different Ncontents. Vegetable crops were found to have the highest value while ferns and mosses ha-ving the lowest value,Most of the plants had an average C content of about 40%─50%which was considered to be normal. The levels of carbon in plants were also depending on thespecies taken in consideration. The highest level was found in evergreen trees while the low-est level being found in vegetable crops. Both N and C levels were found different in differentparts of a plant.In general,N level was lower in root than in stem,leaves or fruits while Clevel was higher in fruits than in stem or leaves. Among different types of soil,sub-alpinemeadow soil had the highest N content and solonez-solonchalk had the lowest N content.TheN content in soil was much higher in the 0-10cm layer than in the 10-20cm layer. The C con-tent was highest in burozem and lowest in meadow drab soil.It was also found to be obviousthat the C content was higher in soils than in plants. In most soils,both N and C contentswere significantly correlated with the organic matter contents. The soils that had been moreintensively used would have correspondingly a less organic matter content.The horizontaldistribution of soil N and C levels in six sub-basins of the Haihe River was characterized by:both the highest N and C levels in the Hutuohe sub-basin,the lowest N level in theYongdinghe sub-basin,the lowest C level in the Daqinghe sub-basin,and the obviouslyregional differentiation of N and C levels in the Hutuohe sub-basin but not in the other sub-basins.
出处
《生态学报》
CAS
CSCD
北大核心
1994年第3期225-234,共10页
Acta Ecologica Sinica
基金
中国科学院"七.五"重大基金
关键词
海河流域
氮
碳
植物
土壤
含量
Haihe River Basin,nitrogen,carbon,soil,plant,Characteristics of contents.
