湖南祁阳县土壤酸化主要驱动因素贡献解析

周海燕,徐明岗,蔡泽江,文石林,吴红慧

Quantitative Analysis of Driving-Factors of Soil Acidification in Qiyang County, Hunan Province

ZHOU HaiYan,XU MingGang,CAI ZeJiang,WEN ShiLin,WU HongHui

表4 祁阳县主要用材林木生物量及枝干皮养分含量[34,35,36]

Table 4 Wood biomass, element contents in stem wood and branches for typical timber forests

林木类型 Tree species 面积 Area (hm2) 生物量 Biomass (kg·hm-2) 树干养分含量 Element content in stem wood (%) 树枝养分含量 Element content in branch wood (%) 树皮养分含量 Element content in bark wood (%) 树干Stem 树枝 Branch 树皮Bark N P K Ca Mg N P K Ca Mg N P K Ca Mg 湿地松 Slash pine 21080 34059 9874 7095 0.194 0.008 0.105 0.214 0.019 0.485 0.036 0.256 0.867 0.07 0.266 0.018 0.086 0.309 0.031 杉木 Fir 20876 62406 9664 8386 0.075 0.007 0.031 0.067 0.015 0.443 0.032 0.289 0.543 0.207 0.283 0.024 0.231 0.432 0.045 马尾松Pine 7905 67400 12100 5910 0.17 0.014 0.121 0.235 0.05 0.381 0.026 0.143 0.164 0.099 0.477 0.042 0.353 0.856 0.144 竹 Bamboo 7108 42685 3488 - 0.247 0.016 0.225 0.013 0.029 0.386 0.017 0.108 0.015 0.02 - - - - -