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六盘山林区几种土地利用方式植被活体生物量C贮量的研究

, PP. 277-283

Keywords: 天然次生林,农田,草地,人工林,植被活体,C贮量

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Abstract:

通过野外调查测定,研究了六盘山林区天然次生林(杂灌林、山杨和辽东栎林)、农田、草地和人工林(13、18和25年生华北落叶松)植被活体生物量的C贮量。结果表明,天然次生林植被地上生物量C贮量为14.93~25.92 t.hm-2,根系为6.50~7.55 t.hm-2;人工林地上为11.97~45.39 t.hm-2,根系为6.48~7.64 t.hm-2;农田和草地地上分别为0.83和1.09 t.hm-2,根系分别为0.49和1.61 t.hm-2。植被活体生物量C年均积累量,天然次生林地上为2.97~5.15 t.hm-2.a-1,根系为1.67~2.86 t.hm-2.a-1;人工林地上为5.07~6.49 t.hm-2.a-1,根系为1.90~2.10 t.hm-2.a-1;农田与草地地上分别为0.83和1.09 t.hm-2.a-1,根系分别为1.38和1.03 t.hm-2.a-1。在生长季,草本地上部分C积累呈逐步增长趋势,最高峰在9―10月,10月后下降。细根生物量C的积累量,天然次生林在5、6、9月较高,草地在8月份较低,农田在7和9月较高,人工林在5、9和10月较高。

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