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高寒沙地中间锦鸡儿人工林修复技术研究

Restoration technological for Caragana intermedia plantation in alpine sandy land

  • 摘要: ,以青海省海南州共和盆地沙地不同林龄中间锦鸡儿人工林为研究对象,设置隔行平茬、隔2行平茬1行和品字形平茬处理,以未平茬林为对照,对新生灌丛生长状况进行分析,研究高寒沙区中间锦鸡儿人工林最适修复技术。结果表明:各平茬措施下新生灌丛生物量和叶面积显著高于未平茬当年生枝条,采取平茬措施后新生灌丛生物量增加约2~13倍,叶面积增加约为0.7~3.1倍,平茬后灌丛株高、基径、冠幅和生物量与未平茬灌丛当年生枝条生物量和叶面积呈显著正相关关系;冗余分析结果表明,林龄和平茬措施对新生灌丛生长指标的解释程度分别为23.10%和68.99%,平茬灌丛的枝生物量、叶生物量和总生物量均与林龄呈较强的负相关关系;主成分分析表明各平茬措施综合评价排序为隔行平茬>品字形平茬>隔2行平茬1行。

     

    Abstract: To explore the most suitable restoration techniques for Caragana intermedia plantations in alpine sandy land, this study was conducted in different ages of C. intermedia plantations in sandy land of Gonghe Basin, Qinghai Province. Three stumping treatments were set up in all plantations: alternate stumping, alternate 2 lines stumping 1 line and delta-shaped stumping, the no stumping plantations were used as the control. The growth status indicators of the newly grown shrubbery were studied. The results showed that the biomass and leaf area of the new shrubbery with all stumping treatments were significantly higher than those of the current-year shoots of no stumping shrub (P < 0.05). The biomass of the new shrub increased by about 2~13 times and the leaf area increased by about 0.7-3.1 times after the stumping measures, the biomass and leaf area of the current-year shoots of the no stumping shrub were significantly positively correlated with the height, basal diameter, crown and biomass of the newly grown shrubbery after stumping. The Redundancy Analysis (RDA) indicated that the explanation degree of plantation age and stubble measures on the growth index of new shrub was 23.10 % and 68.99 %, and the biomass of the newly grown shrubbery was negatively correlated with the plantation age. The results of Principal Component Analysis (PCA) showed that the comprehensive evaluation order of various stubble measures was alternate stumping > triangle shape stumping > alternate two lines stumping one line. In conclusion, the restoration technology dominated by interlaced stubble can effectively improve the productivity of Caragana intermedia plantation in alpine sandy land, and it is better to implement stumping management measures before the plantation begins to degrade.

     

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