荒漠草原-灌丛镶嵌体的植被稳态转变特征
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国家自然科学基金项目(31860677);国家重点研发计划课题(2016YFC0500505);宁夏科技支撑计划项目(2015惠民计划);宁夏高等学校一流学科建设资助项目(NXYLXK2017A01)


Bistable-state of vegetation shift in the desert grassland-shrubland anthropogenic Mosaic area
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    摘要:

    以柠条锦鸡儿(Caragana korshinskii)灌丛引入形成荒漠草原-灌丛地镶嵌体为研究对象,选择其内部荒漠草地(DG)、草地边缘(GE)、灌丛边缘(SE)、灌丛地(SL)为试验样地,开展荒漠草原向灌丛地人为稳态转变过程土壤水分与植被变化特征研究。结果如下:各样地0-200 cm土层水分含量随着转变过程呈显著降低趋势(P<0.05),其中荒漠草地、草地边缘和灌丛边缘样地的土壤水分均在秋季雨水补充期增加,灌丛地由于深层土壤水分过度消耗而愈加降低,且灌丛边缘和灌丛地深层水分显著低于荒漠草地、草地边缘(P<0.05),垂直动态不显著;地上植被随样地转变除优势度指数表现为灌丛地多样性、均匀度、丰富度指数均显著低于各样地(P<0.05),多年生优势草本蒙古冰草(Agropyron mongolicum)、短花针茅(Stipa breviflora)逐渐被一年生草本刺藜(Dysphania aristata)、猪毛蒿(Artemisia scoparia)所代替;土壤种子库萌发种类随样地转变逐渐减少,种子库密度则显著升高(P<0.05),灌丛地以一年生草本植物为主(占总密度的97.51%),荒漠草地则以多年生草本萌发为主,且各样地土壤萌发种子库及多年生草本多集中于0-5 cm土层(P<0.05);转变过程荒漠草原和灌丛地植被地上地下相似度分别为0.14和0.19,均显著低于两边缘样地0.35,较两边缘样地群落更为稳定,呈现草原灌丛化过程中草地-灌丛共存的植被双稳态特征。

    Abstract:

    In this paper, desert grassland, grassland edge, shrub edge, and shrubland were selected as four transition sites in a typical anthropogenic desert grassland-shrubland mosaic in desert steppe of eastern Ningxia, China. The soil moisture, above-vegetation and soil seed bank were investigated to understand the response of vegetation to the desert grassland-shrubland state anthropogenic transition. The results showed that the soil moisture of 0-200 cm soil layer in each site presented a significant downward trend with the transition (P<0.05), and the soil moisture in desert grassland, grassland edge and shrubland edge were increased with the autumn rain supplement, while that in shrubland decreased due to the depletion of the deep soil water by shrubs. The deep soil moisture in shrubland edge and shrubland were significantly lower than those in desert grassland, grassland edge (P<0.05), while there were in no significant vertical distribution dynamics in these two sites. Except for the dominance index, the diversity, uniformity, and richness indexes in the shrubland were significantly lower than those in other three sites (P<0.05),and the perennial dominant herbs Agropyron mongolicum, Stipa breviflora were gradually replaced by annual herbs Dysphania aristata and Artemisia scoparia. The germination species number of soil seed bank decreased gradually, however, the density of seed banks increased significantly with the transition (P<0.05),and the soil seed banks germinated in shrubland were dominated by annual herbs (accounting for 97.51% of the total density), while which in desert grassland were mainly perennial herb. And the germination of soil seed bank and perennial herb in four sites were concentrated in 0-5 cm soil layer (P<0.05); The similarity coefficient (SC) between above-ground vegetation and underground soil bank in the grassland and shrubland were 0.14 and 0.19, respectively, which were significantly lower than the SC in the two edge sites (0.35), and the two sites were relatively stable than the edge sites, occurring the bistable state of vegetation shift in the process of desert grassland-shrubland anthropogenic transition.

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于露,王红梅,郭天斗,杨青莲,孙忠超.荒漠草原-灌丛镶嵌体的植被稳态转变特征.生态学报,2021,41(24):9773~9783

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