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马尾松混交林细根生物量研究

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  • 国家科技期刊平台
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  • NSTL
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  • 维普
采用钻土芯与内生长相结合的研究方法,将马尾松占其混交林的组成比例分成5种类型(0 ～ 20％、21％ ～ 40％、41％ ～ 60％、61％ ～ 80％和81％～ 100％),设置15块20m×20m的标准样地,系统比较了不同比例马尾松混交林(马尾松占林分胸高断面积的比例)细根生物量的分布状况、细根生长量及季节动态变化.结果表明:(1)马尾松不同的混交比例对细根生物量有较大影响,不同混交比例林分的细根生物量的大小依次为,马尾松混交比例41％ ～ 60％＞0～ 20％＞ 21％ ～ 40％＞ 81％ ～ 100％＞ 61％ ～ 80％.(2)5种比例混交林分的细根生物量垂直分布规律均很明显,随土层增加细根生物量趋于减少,且大部分细根集中于土壤表层0～ 10 cm的范围内.这与该地区的土层较浅以及树种根系的分布特性(深根、浅根树种)密切相关.(3)5种马尾松混交林细根生物量季节动态均呈单峰变化,均在6、7月份达到峰值,在1月份达到最低值,41％ ～ 60％林分年生物量净增值比其他4种混交林分要高.(4)5种混交林分的细根年生长量随季节变化明显,最大值出现在6～8月份,最小值出现在12 ～3月份.各个混交林分细根年生长量大小依次为41％ ～ 60％＞ 61％～80％＞ 21％ ～ 40％＞ 81％ ～ 100％＞0～ 20％.
Biomass and nutrient of fine-root in masson pine mixed forest
In this article, 15 standard sample plots of 20 m×20 m were set in Dashan village, Zongyang county of Southern Anhui to analyze the effects of tree species composition on distribution, growth and seasonal dynamics of fine root biomass in 5 kinds of 20-year-old masson pine and broad-leaved mixed forests with combination of soil drilling and inner growth methods. The results are as follows. (1) Differences in species composition have a great effect on fine root biomass; the order for fine root biomass in 5 kinds of stands is 41%-60% > 0-20% > 21%-40% > 81%-100% > 61%-80%. (2) Fine root biomass increase with rise of soil layer for all sampling forest stands of masson pine and broad-leaved mixed woods. The vertical distribution might be closely related to soil depth and root characteristics in Dashan area. (3) Seasonal dynamics of five kinds of masson pine and broad-leaved mixed forest present a unimodal curve, and the maximum occurred in June and July, while the minimum in January. As to net value of biomass, the highest is in 41%-60% masson pine mixed woods. (4) The largest growth occurred from June to August, and the smallest from December to next March. The annual production of fine root in all stands were ranked by 41%-60% > 61%-80% > 21%-40% > 81%-100% > 0-20%.

Masson pine mixed woodfine-root biomassZongyang county in Anhui province

王力、吴福金、邓文鑫、余学明、吴磊

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宣州区林业局,宣城242000

马尾松混交林 细根生物量 安徽枞阳

2013

安徽农业大学学报
安徽农业大学

安徽农业大学学报

CSTPCDCSCD北大核心
影响因子：0.412
ISSN：1672-352X
年,卷(期)：2013.40(2)
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