Distribution, species richness, and relative importance of different plant life forms across drylands in China

被引：0

作者：

Yao, Shuran ^{[1
]}

Hu, Weigang ^{[1
]}

Ji, Mingfei ^{[1
]}

Degen, Abraham Allan ^{[2
]}

Du, Qiajun ^{[1
]}

Akram, Muhammad Adnan ^{[1
]}

Sun, Yuan ^{[1
]}

Sun, Ying ^{[1
]}

Deng, Yan ^{[1
]}

Dong, Longwei ^{[1
]}

Gong, Haiyang ^{[1
]}

Hou, Qingqing ^{[1
]}

Xie, Shubin ^{[1
]}

Wang, Xiaoting ^{[1
]}

Ran, Jinzhi ^{[1
]}

Schmid, Bernhard ^{[3
]}

Guo, Qinfeng ^{[4
]}

Niklas, Karl J. ^{[5
]}

Deng, Jianming ^{[1
]}

机构：

[1] Lanzhou Univ, Coll Ecol, State Key Lab Herbage Improvement & Grassland Agro, Lanzhou 730000, Peoples R China

[2] Ben Gurion Univ Negev, Inst Desert Res, Wyler Dept Dryland Agr, Desert Anim Adaptat & Husb, IL-8410500 Beer Sheva, Israel

[3] Univ Zurich, Dept Geog, Winterthurerstr 190, CH-8057 Zurich, Switzerland

[4] USDA Forest Serv, Eastern Forest Environm Threat Assessment Ctr, Res Triangle Pk, NC 27709 USA

[5] Cornell Univ, Sch Integrat Plant Sci, Plant Biol Sect, Ithaca, NY 14853 USA

来源：

PLANT DIVERSITY | 2025年 / 47卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Drylands; Environmental gradients; Plant life forms; Relative importance; Species richness; Threshold; DISTRIBUTION PATTERNS; ATTRIBUTES DETERMINE; CLIMATE; DIVERSITY; PRECIPITATION; PHYLOGEOGRAPHY; DETERMINANTS; BIODIVERSITY; GRADIENT; MOISTURE;

D O I：

暂无

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Studies on plant diversity are usually based on the total number of species in a community. However, few studies have examined species richness (SR) of different plant life forms in a community along large-scale environmental gradients. Particularly, the relative importance (RIV) of different plant life forms in a community and how they vary with environmental variables are still unclear. To fill these gaps, we determined plant diversity of ephemeral plants, annual herbs, perennial herbs, and woody plants from 187 sites across drylands in China. The SR patterns of herbaceous plants, especially perennial herbs, and their RIV in plant communities increased with increasing precipitation and soil nutrient content; however, the RIV of annual herbs was not altered along these gradients. The SR and RIV of ephemeral plants were affected mainly by precipitation seasonality. The SR of woody plants had a unimodal relationship with air temperature and exhibited the highest RIV and SR percentage in plant communities under the harshest environments. An obvious shift emerged in plant community composition, SR and their critical impact factors at 238.5 mm of mean annual precipitation (MAP). In mesic regions (> 238.5 mm), herbs were the dominant species, and the SR displayed a relatively slow decreasing rate with increasing aridity, which was mediated mainly by MAP and soil nutrients. In arid regions (< 238.5 mm), woody plants were the dominant species, and the SR displayed a relatively fast decreasing rate with increasing aridity, which was mediated mainly by climate variables, especially precipitation. Our findings highlight the importance of comparative life form studies in community structure and biodiversity, as their responses to gradients differed substantially on a large scale. Copyright (c) 2025 Kunming Institute of Botany, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY (http://creativecommons.org/licenses/by-nc-nd/4.0/).

引用

页码：273 / 281

页数：9

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