干旱地区农业研究
榦旱地區農業研究
간한지구농업연구
AGRICULTURAL RESEARCH IN THE ARID AREAS
2013年
6期
121-126
,共6页
范燕敏%武红旗%李美婷%翁小燕
範燕敏%武紅旂%李美婷%翁小燕
범연민%무홍기%리미정%옹소연
土壤类型%光谱特征%土壤有机质%相关性%北疆
土壤類型%光譜特徵%土壤有機質%相關性%北疆
토양류형%광보특정%토양유궤질%상관성%북강
soil type%hyperspectral characteristics%soil organic matter%correlation analysis%North Xinjiang
对北疆地区淡栗钙土、冷钙土、石灰性黑钙土、石膏灰棕漠土等4种土壤类型的反射光谱进行分析,研究土壤有机质含量与光谱反射率之间的关系。结果表明,石灰性黑钙土的反射率明显低于其它土壤类型。有机质含量高于14 g·kg-1时光谱反射率与有机质含量呈负相关,有机质含量很低(<8 g·kg-1)时,土壤的光谱反射率与有机质含量之间呈正相关。分别采用593.6 nm波段的原始光谱反射率、661 nm波段的反射率去除包络线和547.4 nm波段反射率的一阶微分与土壤有机质含量建立回归模型,经检验三种模型均能较好地预测有机质的含量,其中光谱的一阶微分预测精度相对较高,可较好地预测北疆主要类型土壤的有机质含量。
對北疆地區淡慄鈣土、冷鈣土、石灰性黑鈣土、石膏灰棕漠土等4種土壤類型的反射光譜進行分析,研究土壤有機質含量與光譜反射率之間的關繫。結果錶明,石灰性黑鈣土的反射率明顯低于其它土壤類型。有機質含量高于14 g·kg-1時光譜反射率與有機質含量呈負相關,有機質含量很低(<8 g·kg-1)時,土壤的光譜反射率與有機質含量之間呈正相關。分彆採用593.6 nm波段的原始光譜反射率、661 nm波段的反射率去除包絡線和547.4 nm波段反射率的一階微分與土壤有機質含量建立迴歸模型,經檢驗三種模型均能較好地預測有機質的含量,其中光譜的一階微分預測精度相對較高,可較好地預測北疆主要類型土壤的有機質含量。
대북강지구담률개토、랭개토、석회성흑개토、석고회종막토등4충토양류형적반사광보진행분석,연구토양유궤질함량여광보반사솔지간적관계。결과표명,석회성흑개토적반사솔명현저우기타토양류형。유궤질함량고우14 g·kg-1시광보반사솔여유궤질함량정부상관,유궤질함량흔저(<8 g·kg-1)시,토양적광보반사솔여유궤질함량지간정정상관。분별채용593.6 nm파단적원시광보반사솔、661 nm파단적반사솔거제포락선화547.4 nm파단반사솔적일계미분여토양유궤질함량건립회귀모형,경검험삼충모형균능교호지예측유궤질적함량,기중광보적일계미분예측정도상대교고,가교호지예측북강주요류형토양적유궤질함량。
The hyperspectral characteristics of four soil types (Light chesthnut soil,Cold calcic soil,Calcic cher-nozem,Gypsum gray-brown desert soil)in North Xinjiang and their relationship with soil organic matter content (SOM) were studied .The results showed that the spectral reflectance of Calcic chernozem was significantly lower than other soil types .Negative correlation between the spectral reflectance and SOM was detected as SOM was higher than 14 g·kg-1 . By contrast,positive correlation existed with low SOM (<8 g·kg-1 ).Correlation analysis of spectrum reflectance with SOMindicated that SOMcorrelated with the spectrum reflectance in 593.6 nm band,in 661 nm band by removal of the envelope of reflectance,and in 547 .4 nm band through first-order differential of reflectance .In addition,the prediction accuracy of the first-order differential was relatively high,and thus can be used in the estimation SOM of mainly soil types in North Xinjiang .