论文部分内容阅读
通过对南卡罗利纳州山麓上部贫瘠生境的16株41年生火炬松(Pinus taeda L)的分析推导出生物量与营养元素含量的回归方程。已疏伐过2次的林分,伐根以上林分的生物量平均为109. 6吨/公顷。叶部营养元素浓度最高,木材的营养元素浓度最低。营养元素含量范围从磷的10. 4公斤/公顷到氮的123. 2公斤/公顷。冠部仅占伐根以上生物量的20%,包括含氮49%、含磷45%、含钟37%、含钙36%。林分营养元素含量的预测,无论是用各部分营养含量同脚径(dbh)相关的同归方程,还是用各个部分多重预测的总生物量乘其平均营养元素重量浓度的估算,都是相似的。可用少量标准木测定的各部分生物量的营养元素平均重量浓度,并以现实生物量方程预测的林分干重乘这些营养元素平均重量浓度估测其它近熟的火炬松营养元素含量。
The regression equation of biomass and nutrient content was derived from the analysis of 16 Pinus taeda L in the barren habitat in the upper part of the foothills of South Carolina. 6 mt / ha have already been thinned over 2 times of the stand, the biomass of the stand above the cutting point is 109.6 tons / ha. Leaves the highest concentration of nutrients, the lowest concentration of nutrients in wood. Nutrient levels range from 10.4 kg / ha of phosphorus to 123.2 kg / ha of nitrogen. The crown accounts for only 20% of the biomass above the stump, including 49% nitrogen, 45% phosphorus, 37% clock, and 36% calcium. Prediction of nutrient content in stands is similar, either by using the same-body regression equation related to nutrient content of various parts of the soil (dbh), or by multiplying the estimated total biomass of multiple parts by their average nutrient concentration by weight of. The average concentration of nutrients in each part of biomass measured by a small amount of standard wood can be estimated and the content of nutrient elements in other close-cooked parts can be estimated by multiplying the average weight concentration of these parts predicted by the real biomass equation.