本研究以黄河三角洲滨海盐渍土为例,尝试使用HICO(Hyperspectral Imager for the Coastal Ocean)高光谱影像结合现场实测高光谱数据进行表层土壤全盐含量的反演。采用波段组合的方法建立光谱参量,通过相关分析筛选出敏感光谱参量,以决...本研究以黄河三角洲滨海盐渍土为例,尝试使用HICO(Hyperspectral Imager for the Coastal Ocean)高光谱影像结合现场实测高光谱数据进行表层土壤全盐含量的反演。采用波段组合的方法建立光谱参量,通过相关分析筛选出敏感光谱参量,以决定系数R2选出最佳模型;利用HICO影像反射率与实测高光谱反射率之间的关系,对模型进行修正,并应用于影像。研究发现,比值(RI)、差值(DI)波段组合方法建立的光谱参量与表层土壤全盐含量的相关性明显提高。DI_((845,473))、DI_((839,490))、DI_((845,496))及DI_((839,501))的幂函数模型效果最好,且验证决定系数R^2均大于0.86,相对分析误差RPD>3,RMSE较小。此外,HICO遥感影像的模型反演结果较为一致,能够反映表层土壤全盐含量的分布。研究显示,利用高光谱数据进行表层土壤全盐含量的反演建模具有可行性,可为区域表层土壤全盐含量的定量反演提供参考。展开更多
The distribution of soil salinization was investigated based on GIS and field sampling in Tianjin Binhai New Area. The results showed that the average soil total salt content was 0.818%, with an average pH of 8.43, an...The distribution of soil salinization was investigated based on GIS and field sampling in Tianjin Binhai New Area. The results showed that the average soil total salt content was 0.818%, with an average pH of 8.43, and the average CI and Na＋ contents were 0.27% and 0.22%, respectively. Presenting zonal distribution feature, the soil total salt content increased gradually from west to east of Binhai New Area. Statistics on the distribution areas of different salinization degrees showed that the area of non-salinzed soils only accounted for 3.18% of the total area; with an area of 107.43 km2, mild saline soil accounted for 6.34% of the total area; the area of moderate saline soil was 173.51 km2, accounting for 10.24%; and the area of sal- inzed soils was 217.36 km2, accounting for 12.82% of the total soil area. The area of saline soils （total salt content 〉0.6%） was 1 142.8 km2, accounting 67.42% of the total land area in Binhai New Area. And the areas for the soils with total salt content of 0.6%-1.0%, 1.0%-1.5%, 〉1.5% were respectively 388.47, 411.82, 342.51 km2, accounting for 22.92%, 24.3%, 20.21% of the total area.展开更多
Soils are under threat around the world. Erosion, pollution, salinization and acidification degrade soils irreversibly. Evidently, the rate of soil degradation greatly exceeds the rate of soil formation. In some count...Soils are under threat around the world. Erosion, pollution, salinization and acidification degrade soils irreversibly. Evidently, the rate of soil degradation greatly exceeds the rate of soil formation. In some countries, soil lost is almost 100 times faster than the rate of its formation. Therefore, soil needs to be considered as a nonrenewable resource. Incessant construction activities along with unsustainable mining operations and energy-related undertakings in recent years have accelerated the degradation of soil in Turkey. Highway travellers can witness the mindless plunder all over the land. As one travels smoothly on newly constructed highways, looming along the roads are piles of leftover destruction： heaps of broken asphalt from previous roads; newly excavated topsoil dumped into adjacent streams; eroded hillsides. In the age of global climate change, these so-called development efforts sound incomprehensible since such anthropogenic activities exacerbate the change. Clearly, climate change increases the erosion rates and reduces the soil quality. This fact alone requires each country to adopt and implement sound conservation practices to protect their soils, and hence, social stability and security. The most effective way to conserve soil is to establish and maintain ground cover vegetation. Avoiding unnecessary soil sealing also conserves soil.展开更多
文摘本研究以黄河三角洲滨海盐渍土为例,尝试使用HICO(Hyperspectral Imager for the Coastal Ocean)高光谱影像结合现场实测高光谱数据进行表层土壤全盐含量的反演。采用波段组合的方法建立光谱参量,通过相关分析筛选出敏感光谱参量,以决定系数R2选出最佳模型;利用HICO影像反射率与实测高光谱反射率之间的关系,对模型进行修正,并应用于影像。研究发现,比值(RI)、差值(DI)波段组合方法建立的光谱参量与表层土壤全盐含量的相关性明显提高。DI_((845,473))、DI_((839,490))、DI_((845,496))及DI_((839,501))的幂函数模型效果最好,且验证决定系数R^2均大于0.86,相对分析误差RPD>3,RMSE较小。此外,HICO遥感影像的模型反演结果较为一致,能够反映表层土壤全盐含量的分布。研究显示,利用高光谱数据进行表层土壤全盐含量的反演建模具有可行性,可为区域表层土壤全盐含量的定量反演提供参考。
基金Supported by the National Key Technology R&D Program during the 11th Five-Year Plan,China (2007BAD67B01)~~
文摘The distribution of soil salinization was investigated based on GIS and field sampling in Tianjin Binhai New Area. The results showed that the average soil total salt content was 0.818%, with an average pH of 8.43, and the average CI and Na＋ contents were 0.27% and 0.22%, respectively. Presenting zonal distribution feature, the soil total salt content increased gradually from west to east of Binhai New Area. Statistics on the distribution areas of different salinization degrees showed that the area of non-salinzed soils only accounted for 3.18% of the total area; with an area of 107.43 km2, mild saline soil accounted for 6.34% of the total area; the area of moderate saline soil was 173.51 km2, accounting for 10.24%; and the area of sal- inzed soils was 217.36 km2, accounting for 12.82% of the total soil area. The area of saline soils （total salt content 〉0.6%） was 1 142.8 km2, accounting 67.42% of the total land area in Binhai New Area. And the areas for the soils with total salt content of 0.6%-1.0%, 1.0%-1.5%, 〉1.5% were respectively 388.47, 411.82, 342.51 km2, accounting for 22.92%, 24.3%, 20.21% of the total area.
文摘Soils are under threat around the world. Erosion, pollution, salinization and acidification degrade soils irreversibly. Evidently, the rate of soil degradation greatly exceeds the rate of soil formation. In some countries, soil lost is almost 100 times faster than the rate of its formation. Therefore, soil needs to be considered as a nonrenewable resource. Incessant construction activities along with unsustainable mining operations and energy-related undertakings in recent years have accelerated the degradation of soil in Turkey. Highway travellers can witness the mindless plunder all over the land. As one travels smoothly on newly constructed highways, looming along the roads are piles of leftover destruction： heaps of broken asphalt from previous roads; newly excavated topsoil dumped into adjacent streams; eroded hillsides. In the age of global climate change, these so-called development efforts sound incomprehensible since such anthropogenic activities exacerbate the change. Clearly, climate change increases the erosion rates and reduces the soil quality. This fact alone requires each country to adopt and implement sound conservation practices to protect their soils, and hence, social stability and security. The most effective way to conserve soil is to establish and maintain ground cover vegetation. Avoiding unnecessary soil sealing also conserves soil.
