Soil organic matter(SOM)and pH are not only an important part of soil fertility,but also a source of nutrients for plants and an energy source for the life activities of soil microorganisms(Huang,2000).Moreover,soil o...Soil organic matter(SOM)and pH are not only an important part of soil fertility,but also a source of nutrients for plants and an energy source for the life activities of soil microorganisms(Huang,2000).Moreover,soil organic matter(SOM)has a great impact on soil properties and can improve soil fertility and buffering performance.展开更多
The paper, taking Songliao Plain for example, studied the concept, distribution law and formation mechanism of inland saline alkaline wetland. The inland saline alkaline wetland is distributed over the inland region o...The paper, taking Songliao Plain for example, studied the concept, distribution law and formation mechanism of inland saline alkaline wetland. The inland saline alkaline wetland is distributed over the inland region of arid or semi arid climate; it is the wet or slightly stagnant environment, forming saline alkaline soil and salt vegetation and making the geogra phical environment fonming complex with an ecosystem of saline alkaline wetland. The laws of zone nature and non zone nature control the distribution of the inland saline alkaline wetland that extensively spreads in north part of China and other countries. The inland saline alkaline wetland is formed jointly by atmosphere, hydrosphere, lithosphere and biosphere including intellectual sphere. Under the special condition, the artificial activity is possibly the key function. In order to improve the human environment, it is a great duty confronting the whole world to rationally transform the inland saline alkaline wetland. Therefore, we presented an anti inland theory to promote the environment transformation.展开更多
This paper deals with the Pleistocene strata and their depositional environment on theSongliao Plain of Northeast China by applying determinative and analytic techniques of spore-pollen, magnetic stratigraphy, clay mi...This paper deals with the Pleistocene strata and their depositional environment on theSongliao Plain of Northeast China by applying determinative and analytic techniques of spore-pollen, magnetic stratigraphy, clay minerals, isotopic dating, sedimentary facies, etc. Resultsshow that the underlying sand gravel layer below 75-80 m in depth in the central plain belongsto the alluvial-lacustrine deposits with a time range of 2.48-1.87 Ma, known as the lowerlimit of the Quaternary. As to the massive clay layer, its lower part, 40-30 m thick, belongsto the middle late period of the early Pleistocene, ranging from 2.01-0.73 Ma, while its upperpart, 25-21 m thick, belongs to the middle Pleistocene, ranging from 0.73-20 Ma, with amean sedimentation rate of 3-4 mm/1000a under the big lake, long-range gentle and steadydepositional environment.展开更多
自然黑土区是环境演化和气候变化的重要地质记录。研究黑土区形成的时代及古气候环境演变,清楚黑土的形成机制,对黑土资源的可持续利用、保护东北大粮仓具有重要的意义。在松嫩平原东部海伦地区典型黑土剖面中采集15件孢粉样品进行孢粉...自然黑土区是环境演化和气候变化的重要地质记录。研究黑土区形成的时代及古气候环境演变,清楚黑土的形成机制,对黑土资源的可持续利用、保护东北大粮仓具有重要的意义。在松嫩平原东部海伦地区典型黑土剖面中采集15件孢粉样品进行孢粉学研究,并对相同层位土壤样品中总有机碳进行了AMS^(14)C测年。系统的分析、鉴定和研究表明,典型黑土剖面自下而上可划分为2个孢粉组合,下部孢粉组合以Echinate Asteraceae-Artemisia-Boraginaceae-Pinus为代表,上部孢粉组合以Pinus-Amaranthaceae-Artemisia为代表。通过AMS^(14)C测年认为,松嫩平原东部海伦地区典型黑土为中全新世及晚全新世早期的产物。综合元素地球化学、古植物、孢粉分析表明,松嫩平原东部典型黑土主要形成于中全新世7400 a B.P.以来的大暖期,形成于松嫩平原温暖半湿润的气候环境,植被为以草本灌木为主的草原植被。展开更多
对松辽平原的ASTER影像进行几何校正、辐射校正等预处理，并利用归一化水体指数（normalized difference water index）做掩模提取测区内水体，再将实测的水体悬浮物浓度和各波段反射率作相关性回归分析，探求水体中悬浮物的特征波段。...对松辽平原的ASTER影像进行几何校正、辐射校正等预处理，并利用归一化水体指数（normalized difference water index）做掩模提取测区内水体，再将实测的水体悬浮物浓度和各波段反射率作相关性回归分析，探求水体中悬浮物的特征波段。实验表明，当水体中悬浮物含量增加时，ASTER遥感影像的1-4波段水体反射率明显增加，且第3波段水体的反射率与实测水体悬浮物浓度关系最密切。最后确定了利用ASTER影像第3波段与水体悬浮物浓度进行线形拟合的方法反演水体悬浮物浓度。实践证明，利用回归分析所建立的线性反演模型可以很好地反演测区内水体悬浮物浓度。展开更多
基金granted by Evolution and Sustainable Utilization of Land Resources in Key Belts of Global Black Land(IGCP 665)Geochemistry Investigation on Land Quality of Black Soil in Northeast China on the Scale of 1:250,000(Grant No.121201007000150076).
文摘Soil organic matter(SOM)and pH are not only an important part of soil fertility,but also a source of nutrients for plants and an energy source for the life activities of soil microorganisms(Huang,2000).Moreover,soil organic matter(SOM)has a great impact on soil properties and can improve soil fertility and buffering performance.
基金Under the auspices of the project of the Chinese Academy of Sciences(KN95- 02).
文摘The paper, taking Songliao Plain for example, studied the concept, distribution law and formation mechanism of inland saline alkaline wetland. The inland saline alkaline wetland is distributed over the inland region of arid or semi arid climate; it is the wet or slightly stagnant environment, forming saline alkaline soil and salt vegetation and making the geogra phical environment fonming complex with an ecosystem of saline alkaline wetland. The laws of zone nature and non zone nature control the distribution of the inland saline alkaline wetland that extensively spreads in north part of China and other countries. The inland saline alkaline wetland is formed jointly by atmosphere, hydrosphere, lithosphere and biosphere including intellectual sphere. Under the special condition, the artificial activity is possibly the key function. In order to improve the human environment, it is a great duty confronting the whole world to rationally transform the inland saline alkaline wetland. Therefore, we presented an anti inland theory to promote the environment transformation.
基金the National Natural Science Foundation of China.
文摘This paper deals with the Pleistocene strata and their depositional environment on theSongliao Plain of Northeast China by applying determinative and analytic techniques of spore-pollen, magnetic stratigraphy, clay minerals, isotopic dating, sedimentary facies, etc. Resultsshow that the underlying sand gravel layer below 75-80 m in depth in the central plain belongsto the alluvial-lacustrine deposits with a time range of 2.48-1.87 Ma, known as the lowerlimit of the Quaternary. As to the massive clay layer, its lower part, 40-30 m thick, belongsto the middle late period of the early Pleistocene, ranging from 2.01-0.73 Ma, while its upperpart, 25-21 m thick, belongs to the middle Pleistocene, ranging from 0.73-20 Ma, with amean sedimentation rate of 3-4 mm/1000a under the big lake, long-range gentle and steadydepositional environment.
文摘自然黑土区是环境演化和气候变化的重要地质记录。研究黑土区形成的时代及古气候环境演变,清楚黑土的形成机制,对黑土资源的可持续利用、保护东北大粮仓具有重要的意义。在松嫩平原东部海伦地区典型黑土剖面中采集15件孢粉样品进行孢粉学研究,并对相同层位土壤样品中总有机碳进行了AMS^(14)C测年。系统的分析、鉴定和研究表明,典型黑土剖面自下而上可划分为2个孢粉组合,下部孢粉组合以Echinate Asteraceae-Artemisia-Boraginaceae-Pinus为代表,上部孢粉组合以Pinus-Amaranthaceae-Artemisia为代表。通过AMS^(14)C测年认为,松嫩平原东部海伦地区典型黑土为中全新世及晚全新世早期的产物。综合元素地球化学、古植物、孢粉分析表明,松嫩平原东部典型黑土主要形成于中全新世7400 a B.P.以来的大暖期,形成于松嫩平原温暖半湿润的气候环境,植被为以草本灌木为主的草原植被。
文摘对松辽平原的ASTER影像进行几何校正、辐射校正等预处理，并利用归一化水体指数（normalized difference water index）做掩模提取测区内水体，再将实测的水体悬浮物浓度和各波段反射率作相关性回归分析，探求水体中悬浮物的特征波段。实验表明，当水体中悬浮物含量增加时，ASTER遥感影像的1-4波段水体反射率明显增加，且第3波段水体的反射率与实测水体悬浮物浓度关系最密切。最后确定了利用ASTER影像第3波段与水体悬浮物浓度进行线形拟合的方法反演水体悬浮物浓度。实践证明，利用回归分析所建立的线性反演模型可以很好地反演测区内水体悬浮物浓度。
