[1]CUI Huijin,LIU Ju,DU Ziqiang,et al.Hyperspectral Characteristics of the Sorghum Field and Their Relations with Soil Respiration Under the Conditions of Plastic Film Mulching and Biochar Application[J].Research of Soil and Water Conservation,2020,27(03):15-22.
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Hyperspectral Characteristics of the Sorghum Field and Their Relations with Soil Respiration Under the Conditions of Plastic Film Mulching and Biochar Application
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 03
Page number:
15-22
Column:
目次
Public date:
2020-04-20
- Title:
- Hyperspectral Characteristics of the Sorghum Field and Their Relations with Soil Respiration Under the Conditions of Plastic Film Mulching and Biochar Application
- CLC:
- S514
- DOI:
- -
- Abstract:
- Accurate estimate of soil respiration(Rs)in different ecosystems has great significance for the global carbon cycle research. Taking sorghum field as the research sample, we carried out the periodical measurement of both soil respiration and canopy hyperspectral characteristics under the conditions of bio-charcoal addition and plastic film mulching, and established the relationship between the Rs and the canopy hyperspectral indices to provide an approach for indirectly estimate total soil emission based on those dataset. Four different field treatments in the experiment were control(CK), biochar(B), plastic film mulching(P), and biochar + plastic film mulching(B+P). The results are showed as follows.(1)Compared with CK treatment, the P treatment significantly promoted Rs (p<0.05), and there was no significant change in Rs for B treatment. The average value of the Rs in the growing season was 9.43 μmol/(m2·s), 8.88 μmol/(m2·s), 7.35 μmol/(m2·s)and 6.68 μmol/(m2·s)in B+P, P, B and CK treatments, respectively.(2)The reflectance of the near-infrared band of the canopy in different growth stages was different. The reflectance values in the B+P and P treatments were significantly higher than those in the CK and B treatments at jointing stage, but the values in CK and B treatments were significantly higher than those in the P and B+P treatments at heading stage, and no significant difference was found among the four treatments during grain filling and harvesting stages.(3)The spectral reflectance, first derivative spectrum, spectral characteristic parameters, and existing vegetation index of the sorghum canopy were significantly correlated with Rs and the highest correlation coefficient was more than 0.80.(4)Comprehensive consideration for the simulation accuracy and verification precision of the model, the best one for the Rs estimation in the sorghum field could be described as Rs =1666.3R'747+1.332 [R2=0.69, p<0.01, RMSE=2.56 μmol/(m2·s)], and with respect to the verification model, R2, RMSE and slope were 0.75, 2.28 μmol/(m2·s)and 0.715 8, respectively. The results of the study can provide the technical support for making non-destructive monitor for Rs emission from agricultural ecosystems at large scale.
- References:
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Last Update:
2020-04-30