| 云南南涧干热退化山地人工植被恢复初期生物量及土壤环境动态 |
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| 引用本文： | 盛才余 刘伦辉. 云南南涧干热退化山地人工植被恢复初期生物量及土壤环境动态[J]. 植物生态学报, 2000, 24(5): 575-580 |
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| 作者姓名： | 盛才余 刘伦辉 |
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| 作者单位： | 中国科学院西双版纳热带植物园昆明分部,昆明 |
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| 基金项目： | 中国科学院特别支持领域山地灾害──泥石流、滑坡基础研究!（961404）,云南省计委资助 |
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| 摘 要： | 研究了云南南涧干热河谷退化山地人工恢复植被初期阶段(3～5年)主要植物群落的地上生物量和恢复植被后土壤水分及养分的相关动态。结果表明,几种外来植物的适应性强,早期生长迅速并能很快郁闭。人工群落生物量都高于当地次生的坡柳灌草丛。引进种的地上生物量和总平均生长量分别是坡柳的3～16倍和5～20倍,其生长速度也高于乡土树种云南松。雨季人工植被下土壤含水量比光坡地增加约100％,表土层则增加2倍以上。但在旱季,林地土壤含水量与光坡地相近甚至低于光坡地。植被的恢复使土壤养分朝着良性循环转变。土壤有机质、速效钾含量提高,全氮含量稍有降低但不明显,速效磷含量降低,pH值有所下降。这些变化主要发生在土壤表层,人工植被及其土壤生态系统的恢复仍处于不稳定状态。
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| 关 键 词： | 干热河谷 人工植被 生物量 土壤水分和养 |
BIOMASS AND DYNAMICS OF SOIL ENVIRONMENT DURING THE EARLY STAGE OF VEGETATION RESTORATION IN A DEGRADED DRY-HOT MOUNTAIN AREA OF NANJIAN, YUNNAN |
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| SHENG Cai-Yu,LIU Lun-Hui,LIU Wen-Yao. BIOMASS AND DYNAMICS OF SOIL ENVIRONMENT DURING THE EARLY STAGE OF VEGETATION RESTORATION IN A DEGRADED DRY-HOT MOUNTAIN AREA OF NANJIAN, YUNNAN[J]. Acta Phytoecologica Sinica, 2000, 24(5): 575-580 |
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| Authors: | SHENG Cai-Yu LIU Lun-Hui LIU Wen-Yao |
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| Abstract: | This paper presents the results of a study on above ground biomass of the major artificial (revegetation) communities at early stage (3-5 years). It also describes the fluctuation of soil moisture and soil nutrients during vegetation recovery in a degraded dry-hot mountain area of Nanjian county, in western Yunnan. It shows that, 1) many introduced plant species (Tephrosia candida, Pueraria wallichii, Eucalyptus robusta, Acacia richii, A. mearnsii, etc. ) were strongly adapted to the dry-hot climate: they grew rapidly during early stages, with a fast canopy closure occurring in 3-4 years; the total biomass of these artificial communities were higher than that of the local secondary shrub (Dodonaea viscosa) community; the above ground biomass and gross average productivity of the introduced plants were 3-16 times and 5-20 times, respectively, as much as those of Dodonaea viscosa; their growth was also faster than that of the native species Pinus yunnanensis; 2) the soil moisture under the artificial community was twice that of bare slopes; topsoil moisture increased by more than 200% during the rainy season, but in the dry season the soil moisture under the introduced vegetation was close to or even lower than that of bare slopes; 3) soil nutrient cycling also improved after vegetation recovery; while organic matter and available K increased,there was no significant change in total N (it dropped slightly) ; available P and soil pH decreased. Changes of soil nutrients occurred mainly in the topsoil. These results show that restoration of this artificial vegetation community and the associated soil ecosystem was still unstable. |
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| Keywords: | Dry-hot valley Artificial community Biomass Soil moisture and nutrients Restoration |
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