肥沃的海岛土壤促进干旱盐碱地烧毁地区灌木斑块的恢复

IF 3 3区 农林科学 Q2 ECOLOGY
Shilin Wang, Xiaojun Wang, Wen-xia Cao
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引用次数: 0

摘要

灌木的入侵和扩张已在全球广泛报道,在干旱盐碱地尤其严重。恶劣生境灌木具有肥沃岛屿效应,但肥沃岛屿土壤对灌木斑块恢复的促进作用尚不清楚。为了阐明岛屿肥沃土壤在灌丛斑块恢复中的作用,我们以不同体积大小(3.62 ~ 80.21 m3)的柽柳灌木为实验对象。定量分析了丰饶岛效应,测定了灌木林斑块的5年自然恢复情况。研究结果有力地支持了灌木在未烧毁地区形成了肥沃的岛土;林冠下土壤养分含量比灌木外高1.34 ~ 3.09倍,土壤盐分比林冠间低0.03 ~ 0.48倍。灌丛下草本植物多样性显著低于灌丛外,牧草生物量随灌丛体积的增加先增加后减少。当灌木体积为30.22 m3时,牧草生物量最大,但过大的灌木会抑制牧草的生长。在烧毁面积方面,烧毁面积的恢复主要依靠复苗和幼苗。林下幼苗密度、高度、盖度和生物量的平均值分别是林间的0.47倍、2.53倍、2.11倍和5.74倍。结构方程模型计算结果表明:海岛肥沃土对灌木林植被恢复的权重系数为0.45;低盐度对植被恢复的贡献大于高养分和水分含量。因此,与冠间空间相比,灌木斑块通过直接和间接效应强化了肥沃岛效应,促进了灌木林植被的恢复。研究结果揭示了全球气候变化背景下灌木扩张的积极意义,也加深了对被烧毁灌木地可持续发展的认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fertile Island Soils Promote the Restoration of Shrub Patches in Burned Areas in Arid Saline Land
Shrub encroachment and expansion have been widely reported globally and are particularly severe in arid saline land. Shrubs in harsh habitats have fertile island effects, but the promoting effect of fertile island soil on shrub patch restoration remains unclear. To clarify the role of fertile island soils in shrub patch recovery, we took single Tamarix ramosissima shrubs with different volume sizes (3.62–80.21 m3) as experimental subjects. The fertile island effect was quantified, and the 5-year natural recovery of shrub patches in the burned area was measured. The results strongly support that shrubs formed a fertile island soil in unburned areas; soil nutrient content beneath the canopy was 1.34–3.09 times higher than those outside the shrubs, while the soil salinity was 0.03–0.48 times lower than that of intercanopy spaces. The diversity of herbaceous plants beneath shrubs was significantly lower than that of outside shrubs, while the herbage biomass first increased and then decreased with the increase in the volume of shrubs. The maximum biomass of herbage was found when the shrub volume was 30.22 m3, but oversized shrubs could inhibit the growth of herbage. In terms of burned area, the recovery of burned area mainly depends on resprouts and seedlings. The mean values of seedling density, height, coverage, and biomass beneath the canopies were 0.47, 2.53, 2.11, and 5.74 times higher, respectively, than those of the intercanopy spaces. The results of the structural equation models showed the weight coefficient of the fertile island soils for the vegetation recovery in burned shrubland was 0.45; low salinity contributed more to vegetation recovery than high nutrient and moisture contents. Thus, compared with intercanopy spaces, shrub patches reinforce fertile island effects through direct and indirect effects and enhance the recovery of shrubland vegetation in the burned area. Our results demonstrate the positive implications of shrub expansion in the context of global climate change and also deepen the understanding of the sustainable development of burned shrubland.
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来源期刊
Fire-Switzerland
Fire-Switzerland Multiple-
CiteScore
3.10
自引率
15.60%
发文量
182
审稿时长
11 weeks
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