Compatible Biomass Models for Two Dominant Sand-fixing Shrubs in Horqin Sandy Land

doi:10.7522/j.issn.1000-694X.2019.00063

Journal of Desert Research ›› 2019, Vol. 39 ›› Issue (5): 193-199.DOI: 10.7522/j.issn.1000-694X.2019.00063

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Compatible Biomass Models for Two Dominant Sand-fixing Shrubs in Horqin Sandy Land

Hei Weigao¹, Zhan Jin², Han Dan^2,3, Yang Hongling^2,3, Li Yulin²

1. Pingchuan Second Middle School,Baiyin 730914, Gansu, China;
2. Naiman Desertification Research Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2019-07-10 Revised:2019-08-16 Online:2019-09-29 Published:2019-09-29

Abstract

Abstract: Based on the existing shrub biomass model, there is a problem that the components are incompatible with the total amount. In this study, the independent model of new shoot, old shoot, aboveground biomass and the model which was compatible with each component were constructed after the nonlinear regression and nonlinear error variables simultaneous equations were calculated by comparing the relevant morphological indicators and biomass measured data of large samples about two dominant sand-fixing shrubs, Caragana microphylla and Salix gordejevii, were studied in Horqin Sandy Land. The model was evaluated by the largest determination coefficients (R²), the smallest standard error of estimates (SEE), the total relative error (TRE), the average systematic error (MSE/ASE), the mean percent estimate error (MPE) and the average percentage standard error (MPSE). The results showed that the nonlinear weighted regression optimized the independent model fitting effect of the two shrubs, compared with the independent model, the biomass compatible model had poor fitting effect due to the existence of sampling error, and the relevant evaluation index was low.

Key words: sand-fixing shrubs, biomass model, compatibility, sandy land in semi-arid regions

CLC Number:

Q948.1

Hei Weigao, Zhan Jin, Han Dan, Yang Hongling, Li Yulin. Compatible Biomass Models for Two Dominant Sand-fixing Shrubs in Horqin Sandy Land[J]. Journal of Desert Research, 2019, 39(5): 193-199.

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Compatible Biomass Models for Two Dominant Sand-fixing Shrubs in Horqin Sandy Land

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