当前位置: X-MOL 学术Agric. For. Meteorol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Soil water use sources and patterns in shrub encroachment in semiarid grasslands of Inner Mongolia
Agricultural and Forest Meteorology ( IF 6.2 ) Pub Date : 2021-08-05 , DOI: 10.1016/j.agrformet.2021.108579
Xin Liu 1, 2 , Qianlai Zhuang 3 , Liming Lai 1 , Jihua Zhou 1 , Qinglin Sun 1, 2 , Sangui Yi 1, 2 , Benben Liu 1, 2 , Yuanrun Zheng 1
Affiliation  

Soil water sources for shrub encroachment in arid and semiarid regions have not been fully understood. This study used stable δ2H and δ18O isotope ratios of plants, soil water and precipitation, coupled with proportional similarity index of species to identify relations between shrub encroachment and water sources for four shrub and grass species at various shrub encroachment stages in a semiarid grassland of Inner Mongolia. We found that shallow rooted grasses (Agriophyllum squarrosum and Stipa bungeana) predominantly used shallow soil water (0–20 cm) during growing season. In contrast, deeply-rooted semi-shrubs (Artemisia ordosica and Artemisia sphaerocephala) used middle and deep soil water in July but shallow and middle soil depth water in May and September. Plants competition for soil water in different shrub encroachment stages were different depending on plant water use sources. The highest plant competition existed in the A. ordosica community in semi-fixed sandy land, followed by A. squarrosum community in shifting sandy land, A. ordosica community in fixed sandy land, and S. bungeana community in fixed sandy land. Competition for soil water and differences of water use sources of grass and shrub species were crucial in driving shrub encroachment in semiarid grasslands. Communities dominated by A. ordosica were not stable, with an increase in surface soil water availability, the dominance was replaced by S. bungeana. Our findings on the linkage between plant water use sources and patterns and shrub encroachment shall help future arid and semiarid grassland management under changing climate conditions.



中文翻译:

内蒙古半干旱草原灌丛侵占土壤水分利用来源及规律

干旱和半干旱地区灌木侵占的土壤水源尚未完全了解。本研究利用植物、土壤水和降水的稳定 δ 2 H 和 δ 18 O 同位素比值,结合物种的比例相似性指数来确定不同灌木侵占阶段的四种灌木和草类物种的灌木侵占与水源之间的关系。内蒙古半干旱草原。我们发现浅根草(Agriophyllum squarerosumStipa bungeana)在生长季节主要使用浅层土壤水(0-20 cm)。相比之下,根深蒂固的半灌木(Artemisia ordosicaArtemisia sphaerocephala) 7 月使用中深土水,5 月和 9 月使用浅中土深水。不同灌木侵占阶段植物对土壤水分的竞争因植物水分利用来源的不同而不同。最高的工厂竞争中存在的油蒿半固定沙地社区,其次是A.沙米社区流动沙地,油蒿固定沙地社会,长芒草在固定沙地社区。土壤水分的竞争以及草和灌木物种用水来源的差异是驱动半干旱草原灌木侵占的关键。以A. ordosica为主的群落并不稳定,随着表层土壤可用水量的增加,优势被S. bungeana取代。我们关于植物水分利用来源和模式与灌木侵占之间联系的发现将有助于未来气候条件变化下干旱和半干旱草原的管理。

更新日期:2021-08-05
down
wechat
bug