摘要
龙胜里骆杉木人工林乔木层林冠年截留率为１５．６％．林下植物层的年截留率为２１．７％（占林外降水量的１８．３％）。降水强度是影响截留量（率）大小的主要因素；同时，林冠的枝叶生长和林下植物盖度的变化对截留量（率）大小也有一定影响．林冠截留量（率）与林外降水量间存在密切的对数关系，而林下植物截留量（率）与林冠降水量或林外降水量之间的函数关系随不同季节而变化，冬春季为幂函数，夏秋季为直线或对数关系，这主要与降水强度有关。乔木层和林下植物层的养分年淋溶归还量为：氮２．４１，钾１２．０５，镁３．５ｌｋｇ／ｈｍ２，钙和磷则为０．其中，乔木层的淋溶量为：氮２．６８，钾８．９８，镁０．７３，磷和钙为０；林下植物层的淋溶量为：磷０．３５，钾３．１０，钙５．９８，镁２．７８，氮为０。植物叶子的养分组成及其养分吸收特点对乔木层和林下植物层的养分淋溶过程有明显的影响。
Rainfall interception of the concerned tree canopy was 15.6%, and that of the undergrowth 21.7% (making up 18.3% of the atmospheric precipitation) in Chinesefir plantation of Liluo in Longsheng. Rainfall intensity was a major factor influencing the interception, and growth of tree canopy. Changes of the ubdergrowth cover also affect interception to a certain extent. A significant correlation of logarithm function exists between the interception of the tree canopy and the atmospheric precipitation. The amount of the rainfall intercepted varies in different seasons. In winter—spring the equations are the power functions and in summer—autumn, linear or logarithm functions. They are chiefly correlated with rainfall intensity. The annual nutrient return of rainfall washing from tree canopy and undergrowth is: N, 2.41;K, 12.05;Mg, 3.05kg/ha;and Ca and P, zero. Rainfall washing from tree canopy is: N, 2.68; K, 8.98; Mg, 2.78kg/ha;and N, zero. Nutrient components of living leaves and nutrient uptaking characteristics of plants affect on nutrient washing process of the tree canopy and undergrowth substantially.
出处
《自然资源》
CSCD
北大核心
1995年第6期44-50,共7页
关键词
杉木林
降水截留量
养分淋溶
乔木层
林下植物
Chinesefir plantation
Rainfall interception
Nutrient washing
Arbor layer
Undergrowth
