Abiotic factors affect leaf litter mass loss more strongly than initial litter traits under sand burial conditions

被引：13

作者：

Qu, Hao ^{[1
,2
]}

Zhao, Xueyong ^{[1
,2
]}

Wang, Shaokun ^{[1
]}

Lian, Jie ^{[2
]}

Tang, Xia ^{[2
]}

Wang, Xinyuan ^{[3
]}

Zhang, Rui ^{[1
,2
]}

Medina-Roldan, Eduardo ^{[4
]}

机构：

[1] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Urat Desert Grassland Res Stn, Lanzhou 730000, Peoples R China

[2] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Naiman Desertificat Res Stn, Lanzhou 730000, Peoples R China

[3] Ecol Environm Supervis & Adm Bur Gansu Prov, Lanzhou 730020, Peoples R China

[4] Xian Jiaotong Liverpool Univ, Hlth & Environm Sci Dept, Suzhou 215123, Peoples R China

来源：

CATENA | 2021年 / 196卷

基金：

中国国家自然科学基金;

关键词：

Litter mass loss; Sand burial; Shrubs; Horqin Sandy Land; Light intensity; UV-B RADIATION; DECOMPOSITION RATES; NITROGEN DYNAMICS; PLANT COMMUNITY; ORGANIC-CARBON; LAND; FORESTS; PRECIPITATION; GRASSLAND; EXPOSURE;

D O I：

10.1016/j.catena.2020.104900

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Litter decomposition is an important ecosystem process and a key determinant of nutrient turnover and carbon cycling in arid and semiarid regions. Sand burial is common in arid and semiarid regions and may strongly influence litter decomposition. However, the main factors influencing litter decomposition under sand burial conditions are uncertain. We performed a litter bag experiment over 3 years to understand the effects of sand burial on litter mass loss and measured abiotic factors (light intensity, soil temperature and humidity) and initial litter traits to determine which factors most influenced litter mass losses. The leaf litters of three dominant shrubs (Artemisia halodendron, Caragana microphylla, and Salix gordejevii) in the Horqin Sandy Land of northern China were selected, and four burial depths (surface, 5 cm, 10 cm, and 20 cm) were used. The results showed that the litter from the three shrubs under the surface treatment (no burial) and at the 5 cm burial depth decomposed more rapidly than the litter that was buried at depths of 10 cm and 20 cm. This is explained because the abiotic factors on the surface and at 5 cm burial depth were conducive for the mass loss of litter. The differences in litter mass losses among the three shrubs were not significant under other burial treatments, except that A. halodendron's litter decomposed significantly faster than litter from the other two shrubs at depths of 10 cm. Species differences in litter traits were weaker than the effects of burial depths and retrieval times on litter mass loss. The stepwise regression analysis showed that light intensity and soil temperature were the most important factors influencing the mean litter mass loss of 3 years. Therefore, we concluded that relative to the initial litter traits, abiotic factors are more able to indicate the leaf litter mass loss under sand burial conditions, and abiotic factors limiting litter mass loss switch with burial depths.

引用

页数：9