Biomass allocation and its ecological significance of three dominant sand-fixing shrubs in the semi-arid desert area

doi:10.7522/j.issn.1000-694X.2020.00039

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (5): 149-157.DOI: 10.7522/j.issn.1000-694X.2020.00039

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Biomass allocation and its ecological significance of three dominant sand-fixing shrubs in the semi-arid desert area

Jin Zhan¹(), Yulin Li¹(), Dan Han¹^,², Hongling Yang¹^,²

^1.Naiman Desertification Research Station，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.University of Chinese Academy of Sciences，Beijing 100049，China

Received:2020-03-23 Revised:2020-06-09 Online:2020-09-28 Published:2020-09-28
Contact: Yulin Li

Abstract

Abstract:

In order to explored the biomass allocation patterns of three dominant sand-fixing shrubs in Horqin Sandy Land， we investigated the biomass components and their proportions， R/S， proportions of above-ground new biomass， aboveground new biomass and old branch biomass ratio， and their correlation with crown width and the relationship between underground and above-ground biomass of Salix gordejevii， Artemisia halodendron and Caragana microphylla on the individual level. The results showed that：（1）The biomass and proportion of three dominant sand-fixing shrubs in Horqin Sandy Land were significantly different （P<0.05）， the size and proportion of old branch biomass were the first and the NAB/OBA values were 43.90% about Salix gordejevii； the proportion of above-ground biomass were the largest and the new above-ground biomass was 2.43 times that of old branch biomass about A. halodendron； the Underground biomass were concentrated in shallow soil and there were no deep root system （root length>100 cm） of S. gordejevii and A. halodendron. （2）The size of underground biomass and its proportion， R/S were in the first place about C. microphylla； the underground biomass was mainly distributed in the root length >30 cm layer，the proportion of the amount reached 61.61%， and the layer of deep roots （root length>100 cm） accounted for 22.33% of the total biomass. （3）The R/S， NAB/AGB and NAB/OBA of S. gordejevii and A. halodendron showed a negative linear relationship with the crown width； In the late stage of sand fixation， the above-ground new part of S. gordejevii and A. halodendron would decrease with the increase of crown width， productivity would decrease， and vegetations would decline. （4）The allogeneic growth models of aboveground and underground biomass of three shrubs were obtained by nonlinear regression fitting： Salix gordejeviiy=2.928x^1.039（R²=0.901， P<0.01） A. halodendrony=32.802x^0.685（R²=0.469， P<0.01）， C. microphyllay=1.337x^0.066（R²=0.833， P<0.01）.

Key words: biomass allocation, shrubs, Horqin Sandy Land

CLC Number:

Q948.1

Jin Zhan, Yulin Li, Dan Han, Hongling Yang. Biomass allocation and its ecological significance of three dominant sand-fixing shrubs in the semi-arid desert area[J]. Journal of Desert Research, 2020, 40(5): 149-157.

Figures/Tables 8

Table 1 Characteristics of three dominant sand-fixing shrubs

植物名称	样本数 /株	平均值		最大值		最小值		标准误
植物名称	样本数 /株	株高/m	冠幅/m	株高/m	冠幅/m	株高/m	冠幅/m	株高/m	冠幅/m
黄柳	55	1.78	1.20	2.68	1.72	1.06	0.76	0.06	0.03
差不嘎蒿	58	0.85	1.79	1.20	2.60	0.6	1.23	0.02	0.04
小叶锦鸡儿	60	1.30	1.71	2.00	2.79	0.70	0.75	0.03	0.06

Fig.1 The biomass of each component of the three dominant sand-fixing shrubs

Fig.2 Vertical distribution and each proportion of belowground biomass of the three dominant sand-fixing shrubs

Fig.3 The proportion of each biomass component and R/S of the three dominant sand-fixing shrubs

Fig.4 The proportion of new biomass and ratio of aboveground biomass to old shoot biomass of the three dominant sand-fixing shrubs

Table 2 The relation of crown about R/S, new biomass and ratio of aboveground biomass to old shoot biomass of three dominant sand-fixing shrubs

指标	冠幅
指标	黄柳	差不嘎蒿	小叶锦鸡儿
R/S	-0.453^**	-0.284^*	-0.430^**
NAB/AGB	-0.389^**	-0.205	-0.044
NAB/OBA	-0.403^**	-0.283^*	-0.085

Fig.5 Linear regressions between crown and R/S,new biomass and ratio of aboveground biomass to old shoot biomass of three dominant sand-fixing shrubs

Fig.6 Root-shoot biomass allometry growth model of the three dominant sand-fixing shrubs

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Biomass allocation and its ecological significance of three dominant sand-fixing shrubs in the semi-arid desert area

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