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首页> 外文期刊>Ecotropica >Composition, diversity, and biomass of herbaceous species and functional groups in a gradient of nitrogen amendment in a dry tropical environment of India.
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Composition, diversity, and biomass of herbaceous species and functional groups in a gradient of nitrogen amendment in a dry tropical environment of India.

机译：在印度干旱的热带环境中，氮素修正梯度下的草本物种和功能组的组成，多样性和生物量。

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摘要

Nitrogen depositions due to anthropogenically induced disturbances are adding more reduced N to the biosphere, and have had considerable impacts on soil and vegetation. The objectives of the present study were to investigate the effects of N application on the diversity and biomass of herbaceous functional groups in a dry tropical environment of India. For this, a total of 135 1-m2 plots distributed in five locations were established in the year 2007 on the campus of Banaras Hindu University, Varanasi, India. Each plot received a randomly chosen dose of N (0 kg N ha-1 yr-1 [control], 60 kg N ha-1 yr-1, or 120 kg N ha-1 yr-1). Vegetation samples were collected in 2009 and 2010. The species diversity of each functional group in each 1-m2 plot was calculated using the Shannon-Wiener index, and peak shoot biomass of the same was established by harvesting. The data were subjected to appropriate statistical analyses. NMS ordination suggested that soil moisture and N amendment caused changes in species and functional group composition and diversity. Location, year, and N amendment all contributed to significant differences in species diversity and biomass. Species diversity was maximum in the 60 kg N ha-1 yr-1 treated plots, while herbaceous above-ground biomass further increased due to the increase in N dose. The increase in total herbaceous biomass along the N amendment was mainly due to an increase in the biomass of grasses as there was a decline in forbs and legumes.
机译：由于人为干扰引起的氮沉降使生物圈中的氮减少更多，并对土壤和植被产生了很大影响。本研究的目的是调查氮的施用对印度干旱热带环境中草本功能基团多样性和生物量的影响。为此，在2007年于印度瓦拉纳西的Banaras印度大学校园内建立了总共135个1-m 2 地块，分布在五个地点。每个地块均接受随机选择的N剂量（0千克N ha -1 yr -1 [对照]，60千克N ha -1 yr -1 或120 kg N ha -1 yr -1 ）。在2009年和2010年收集了植被样本。使用Shannon-Wiener指数计算了每个1-m 2 样地中每个功能组的物种多样性，并通过收获建立了该峰的生物量。 。对数据进行适当的统计分析。 NMS排序表明，土壤水分和氮的修正引起物种和功能组组成及多样性的变化。位置，年份和N的修正都导致物种多样性和生物量的显着差异。在60 kg N ha -1 yr -1 处理的样地中，物种多样性最大，而草本地上生物量由于氮剂量的增加而进一步增加。沿氮修正的总草本生物量的增加主要是由于草和豆类的减少，草的生物量增加了。

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