Quantifying canopy storage capacity and its temporal variation is necessary for evaluating the ecohydrological effects of grassland restoration. In this study, four grassland communities after abandonment of 2, 7, 15 and 30 years on the semiarid Loess Plateau were selected, and canopy storage capacities, canopy structures and species compositions were examined in the growth period (May to September). Canopy, living plant, standing litter and floor litter storage capacities ranged from 0.11–0.56, 0.030–0.51, 0.0070–0.079 and 0.013–0.21 mm, respectively, and all exhibited an increasing trend with restoration year. Canopy storage capacity, vegetation coverage and aboveground biomass reached the maximum in August. Standing and floor litter storage capacities had the highest correlations with their biomass weights. Species diversity reached the maximum in 15 years abandoned grassland, with no significant monthly change. Annual forb, annual grass, perennial forb and perennial forb/grass were the typical dominant species type of 2, 7, 15 and 30 years abandoned grasslands, respectively. Perennial forbs (Artemisia gmelinii, Lespedeza davurica) had higher water storage than those of annual forb (Artemisia capillaris) and grasses (Setaria viridis, Roegneria kamoji). Path analysis revealed that fresh aboveground biomass and dominant species type mainly affected canopy storage capacity. No significant correlations were found between storage capacity and species diversity indexes. These results highlighted the importance of vegetation aboveground biomass and species functional group for evaluating grassland hydrological function and adopting suitable restoration strategy.

中文翻译：

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黄土半干旱区废弃草地群落地上生物量的产生和优势种类型决定的树冠储藏能力

量化冠层存储能力及其时间变化对于评估草地恢复的生态水文效应是必要的。在这项研究中，选择了在半干旱黄土高原放弃2、7、15和30年后的四个草地群落，并在生长期（5月至9月）检查了冠层的贮藏能力，冠层结构和物种组成。冠层，活植物，立式垫料和地面垫料的存储容量分别为0.11-0.56、0.030-0.51、0.0070-0.079和0.013-0.21毫米，并且都随着恢复年的增加而呈现增加趋势。八月份的冠层存储量，植被覆盖率和地上生物量达到最大值。立式和地面垫料的储存能力与其生物量权重具有最高的相关性。荒漠草原物种多样性达到15年来的最大值，没有明显的每月变化。一年生草，一年生草，多年生草和多年生草/草是分别被废弃的2、7、15和30年草地的典型优势种类型。多年生Forbs（蒿（Lespedeza davurica）的蓄水量高于一年生无水草（Artemisia capillaris）和禾本科草（Setaria viridis，Roegneria kamoji）。通径分析表明，新鲜的地上生物量和优势种类型主要影响冠层的储存能力。在存储能力和物种多样性指数之间未发现显着相关性。这些结果强调了地上植被生物量和物种功能群对于评估草地水文功能和采取适当的恢复策略的重要性。