Seasonal Differences in Water-Use Sources of Impatiens hainanensis (Balsaminaceae), a Limestone-Endemic Plant Based on "Fissure-Soil" Habitat Function

被引：6

作者：

Huang, Weixia ^{[1
,2
]}

Zhong, Yunfang ^{[1
]}

Song, Xiqiang ^{[1
,3
]}

Zhang, Cuili ^{[1
]}

Ren, Mingxun ^{[1
]}

Du, Yanjun ^{[1
,3
]}

机构：

[1] Hainan Univ, Minist Educ, Key Lab Genet & Germplasm Innovat Trop Special Fo, Haikou 570228, Hainan, Peoples R China

[2] Hainan Univ, Coll Life & Pharmaceut Sci, Haikou 570228, Hainan, Peoples R China

[3] Hainan Univ, Coll Forestry, Haikou 570228, Hainan, Peoples R China

来源：

SUSTAINABILITY | 2021年 / 13卷 / 16期

基金：

中国国家自然科学基金;

关键词：

Impatiens hainanensis; karst; shallow fissures; hydrogen-oxygen stabilized isotopes; water utilization; KARST ROCKY DESERTIFICATION; STABLE-ISOTOPE TECHNIQUES; WOODY-PLANTS; RAIN-FOREST; DROUGHT; MOISTURE; TREES; PRECIPITATION; XISHUANGBANNA; EVOLUTION;

D O I：

10.3390/su13168721

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The southwestern mountains of Hainan Island are the southernmost region with tropical karst landform in China. The frequent alternation of dry and wet seasons leads to the loss of the mineral nutrients of limestone, creating karst fissure habitats. Plants living in karst fissure habitats for long periods of time have developed local adaptation mechanisms correspondingly. In the paper, hydrogen-oxygen stable isotope technology was applied to determine the water-use sources of Impatiens hainanensis in the dry and wet seasons, hoping to expound the adaptation mechanism of I. hainanensis in karst fissure habitats to the moisture dynamics in the wet and dry seasons. In the wet season (May to October, 2018), the air humidity is relatively high in the I. hainanensis habitat; in the dry season (November 2018 to April 2019), there is a degree of evaporation. In the wet season, fine-root biomass increases with soil depths, while coarse-root biomass decreases with soil depths; in the dry season, fine-root biomass is lower and coarse-root biomass is higher compared with the wet season. It was found that the average rainfall reached 1523 mm and the main water-use sources were shallow (0-5 cm) and middle (5-10 cm) soil water, epikarst water, and shallow karst fissure water during the wet season; the average rainfall reached 528 mm, and the deep (10-15 cm) soil water and shallow karst fissure water were the main water-use sources during the dry season. Fog water has a partial complementary effect in the dry season. The differences in the distribution of root biomass and each source of water in the wet and dry seasons of I. hainanensis also reflect the different water-use strategies of I. hainanensis in the wet and dry seasons. In both dry and wet seasons, I. hainanensis formed a water-use pattern dominated by soil water and shallow fissure water (0-15 cm) under the influence of the "fissure-soil-plant" system in the karst region.

引用

页数：20