文献类型：期刊文献

中文题名：Fertile island effect in the sedimentary process of Tetraena mongolica Maxim nebkhas in steppe–desert ecotones on the Inner Mongolia Plateau,China

英文题名：Fertile island effect in the sedimentary process of Tetraena mongolica Maxim nebkhas in steppe-desert ecotones on the Inner Mongolia Plateau, China

作者：Zhai Bo[1] Dang Xiao-hong[1] Liu Xiang-jie[2] Wang Ji[3]

第一作者：Zhai Bo

通信作者：Wang, J[1]

机构：[1]Inner Mongolia Agr Univ, Coll Desert Sci & Engn, Hohhot 010018, Peoples R China;[2]Chinese Acad Forestry, Desert Forestry Expt Ctr, Deng Kou 01520O, Peoples R China;[3]Natl Positioning Observat Res Stn Hangjin Desert, Ordos 017400, Peoples R China

年份：2022

卷号：19

期号：10

起止页码：2791-2805

中文期刊名：山地科学学报（英文）

外文期刊名：JOURNAL OF MOUNTAIN SCIENCE

收录：CSTPCD;;Scopus(收录号：2-s2.0-85140598894);WOS:【SCI-EXPANDED(收录号:WOS:000873887900004)】；CSCD:【CSCD2021_2022】；PubMed;

基金：This work was supported by the National Natural Science Foundation of China (Grant No. 41967009), the Inner Mongolia Autonomous Region Talent Development Fund (Inner Mongolia Autonomous Region Human Resources and Social Security Office issued [2020]98).

语种：英文

中文关键词：Nebkhas;Sediments;Particle-size distribution;Fertile island;Tetraena mongolica;Ordos Plateau

外文关键词：Nebkhas; Sediments; Particle-size distribution; Fertile island; Tetraena mongolica; Ordos Plateau

分类号：Q948

摘要：Phytogenic mounds(nebkhas)formed by shrubs are a common phenomenon in arid and semiarid areas.The formation of nebkhas is accompanied by the appearance of the fertile island effect.Quantitative evaluation of the shrub sand compost island effect is a key link in preventing soil erosion and nutrient loss.This study took the typical shrub Tetraena mongolica in desert areas as the research object and quantified the sand-trapping capacity of the shrub.We revealed the influence of sediment texture and volumetric soil water content on fertile islands during the development of T.mongolica nebkhas.The results showed that(1)the single shrub intercepted large amounts of sediments due to the high density of branches of T.mongolica,forming nebkhas that were positively correlated with the shrub size.(2)The overall soil nutrient content below the shrub was greater than the soil nutrient content outside the shrub,forming a typical fertile island effect.The soil organic carbon(SOC),alkaline hydrolytic nitrogen(AHN),available phosphorus(AP),and available K(AK)content all increased gradually with increasing nebkha volume.Compared with the deep soil of nebkhas,the nutrient content of the surface soil was generally higher.(3)There was a positive correlation between the volumetric water content and nutrient content in nebkhas.(4)The semi-ellipsoid shape of T.mongolica enabled it to intercept large amounts of coarse-grained material.Fine sand(100–250μm)was the main particle size in the sediment aggregates inside the nebkhas.The fine sand content generally increased with increasing shrub size.Redundancy analysis(RDA)revealed that the fine sand content of the nebkha sediments had a strong positive correlation with the soil nutrient content.This paper provides an example for evaluating the fertile island effect during the deposition process of nebkhas in the desert transition zone.
Phytogenic mounds (nebkhas) formed by shrubs are a common phenomenon in arid and semi-arid areas. The formation of nebkhas is accompanied by the appearance of the fertile island effect. Quantitative evaluation of the shrub sand compost island effect is a key link in preventing soil erosion and nutrient loss. This study took the typical shrub Tetraena mongolica in desert areas as the research object and quantified the sand-trapping capacity of the shrub. We revealed the influence of sediment texture and volumetric soil water content on fertile islands during the development of T. mongolica nebkhas. The results showed that (1) the single shrub intercepted large amounts of sediments due to the high density of branches of T. mongolica, forming nebkhas that were positively correlated with the shrub size. (2) The overall soil nutrient content below the shrub was greater than the soil nutrient content outside the shrub, forming a typical fertile island effect. The soil organic carbon (SOC), alkaline hydrolytic nitrogen (AHN), available phosphorus (AP), and available K (AK) content all increased gradually with increasing nebkha volume. Compared with the deep soil of nebkhas, the nutrient content of the surface soil was generally higher. (3) There was a positive correlation between the volumetric water content and nutrient content in nebkhas. (4) The semi-ellipsoid shape of T. mongolica enabled it to intercept large amounts of coarse-grained material. Fine sand (100-250 mu m) was the main particle size in the sediment aggregates inside the nebkhas. The fine sand content generally increased with increasing shrub size. Redundancy analysis (RDA) revealed that the fine sand content of the nebkha sediments had a strong positive correlation with the soil nutrient content. This paper provides an example for evaluating the fertile island effect during the deposition process of nebkhas in the desert transition zone.