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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >A case of high tree diversity in a sal (Shorea robusta)-dominated lowlandforest of Eastern Himalaya: Floristic composition, regeneration andconservation
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A case of high tree diversity in a sal (Shorea robusta)-dominated lowlandforest of Eastern Himalaya: Floristic composition, regeneration andconservation

机译：喜马拉雅东部萨尔州（Shorearobusta）为主的低地森林中高树多样性的案例：植物组成，更新和保护

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A seasonally dry, Sal (Shorea robusta)-dominated forest in the Eastern Himalayan lowlands of the Mahananda Sanctuary, Darjeeling had a far greater species richness (87 species in greater than or equal to 10 cm and 69 species in greater than or equal to 30 cm girth class) and diversity than other sal forests in India. Euphorbiaceae, with 8 species, was the most speciose family followed by Lauraceae, Meliaceae and Leguminosae. Dispersion of species was either clumped or random, and only two species were uniform. Rare species (less than or equal to 1 stem ha(-1)) constituted 36% of the flora and were randomly distributed. Tree species dominated the flora with 87.3% share. Mixed dominance of species groups prevailed in the forest, i.e. large, medium and small trees and shrubs shared stand density in nearly equal proportions, but climbers were less abundant. Among five most abundant species, none was a large tree. However, four of the five species accumulating maximum basal area were large trees. All the girth classes showed a multi-species dominance, with 21 species in mature ( greater than or equal to 180 cm girth), 40 in elder (greater than or equal to 90 to < 180 cm), 55 in young ( greater than or equal to 30 to < 90 cm), and 68 in juvenile class ( greater than or equal to 10 to < 30 cm). Six species were available only in seedling layer (greater than or equal to 30 cm height to < 10 cin girth). Thus of all 93 species, 20.4% showed good regeneration, 10.8% fair, 30.1% poor and 17.2% lacked regeneration. The remaining 21.5% species seem to be reappearing. While high-grade timber species were poorly regenerating, shrubs and climbers were regenerating well. Despite legal protection, this diverse sal forest continually experiences anthropogenic interference by the inhabitants on fringes. Rare species that contribute maximum to the tree diversity are at high risk of local extinction.
机译：大吉岭的季节性干燥，以萨尔（Shorearobusta）为主的森林位于马哈南达保护区的东部喜马拉雅低地，物种丰富度更高（大于或等于10厘米的有87种，大于或等于30的有69种）。厘米周长等级）和多样性。大戟科有8种，是最丰富的科，其次是月桂科，Mel科和豆科。物种的散布要么成簇，要么随机，只有两个物种是均匀的。稀有物种（小于或等于1个茎ha（-1））构成植物区系的36％，并且是随机分布的。树种以87.3％的份额主导了植物区系。森林中普遍存在种群的混合优势，即大，中，小树木和灌木以几乎相等的比例共享林分密度，但攀援者则较少。在五个最丰富的物种中，没有一棵大树。然而，在五个具有最大基础面积的物种中，有四个是大树。所有周长类别均显示出多物种优势，其中成熟的21种（周长大于或等于180厘米），老年人的40种（大于或等于90至<180 cm），幼龄的55个（大于或等于150厘米）。等于30到<90厘米），少年组为68（大于或等于10到<30厘米）。仅种苗层中有六种（大于或等于30厘米高，围长小于10厘米）。因此，在所有93个物种中，有20.4％的物种表现出良好的再生能力，有10.8％的物种具有良好的再生能力，有30.1％的物种表现较差，有17.2％的物种缺乏再生能力。其余21.5％的物种似乎正在重新出现。高档木材的再生不良，而灌木和攀援植物的再生良好。尽管受到法律保护，但这种多样的盐林不断受到边缘居民的人为干扰。对树木多样性贡献最大的稀有树种极有可能发生局部灭绝。

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