Application of Caesium-137 Technique on Wind Erosion in Gonghe Basin, Qinghai Province (I)-~(137)Cs Distribution Characteristics
Application of Caesium-137 Technique on Wind Erosion in Gonghe Basin, Qinghai Province (I)-~(137)Cs Distribution Characteristics
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
Y. Ping
中科院分区：
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作者：
Y. Ping
Wind erosion is the first step to sandy desertification, and it is obvious that the accurate measurement and estimation of wind erosion rate is urgent and essential. Owing to the complexity, randomness and boundlessness of the processes, it is difficult to measure or estimate the wind erosion rate precisely at present. Current methods that include field observation, wind tunnel tests and wind erosion model have some limitations in their practicability, cost and accuracy. The world\|fallout of \{\{\}137Cs\} associated with the nuclear weapons tests during 1950s and 1960s has provided a valuable man\|made tracer for studing soil erosion and sediment delivery. Since its first introduction in the 1970s, \{\{\}137Cs\} technique has received wide application in water erosion research, leading to profound accomplishments. But it was not applied to wind erosion until the 1990s and still remains insufficiency in this respect. Taking the Gonghe Basin in Qinghai Province as the study area, the paper attempts to introduce the \{\{\}137Cs\} method to study soil wind erosion. Through specific sampling strategy and methods, large number of \{\{\}137Cs\} samples with different soil types or land uses are gathered and analyzed. From those \{\{\}137Cs\} data, some \{\{\}137Cs\} distribution characteristics over the whole area are clarified. The 0~30 cm \{\{\}137Cs\} activity of different land types is found to be in the order of woodland\%playa\%cold grasslanddry farmland≈dry grasslandfixed dunedesertified grasslandshifted duneeroded land, while the \{\{\}137Cs\} inventory of different land types is in the order of \%playa\%woodlandshifting dunecold grasslanddry farmland≈dry grasslandfixed dunedesertified grasslanderoded land. The \{\{\}137Cs\} distribution in the soil profile can be divided into four types of normal profile, aggrading profile, eroding profile and disturbed profile. The cold grassland that maintained the relatively perfect normal profile of original \{\{\}137Cs\} fallout can be regarded as ideal sampling site of \{\{\}137Cs\} reference.
Wind erosion is the first step to sandy desertification, and it is obvious that the accurate measurement and estimation of wind erosion rate is urgent and essential. Owing to the complexity, randomness and boundlessness of the processes, it is difficult to measure or estimate the wind erosion rate precisely at present. Current methods that include field observation, wind tunnel tests and wind erosion model have some limitations in their practicability, cost and accuracy. The world\|fallout of \{\{\}137Cs\} associated with the nuclear weapons tests during 1950s and 1960s has provided a valuable man\|made tracer for studing soil erosion and sediment delivery. Since its first introduction in the 1970s, \{\{\}137Cs\} technique has received wide application in water erosion research, leading to profound accomplishments. But it was not applied to wind erosion until the 1990s and still remains insufficiency in this respect. Taking the Gonghe Basin in Qinghai Province as the study area, the paper attempts to introduce the \{\{\}137Cs\} method to study soil wind erosion. Through specific sampling strategy and methods, large number of \{\{\}137Cs\} samples with different soil types or land uses are gathered and analyzed. From those \{\{\}137Cs\} data, some \{\{\}137Cs\} distribution characteristics over the whole area are clarified. The 0～30 cm \{\{\}137Cs\} activity of different land types is found to be in the order of woodland\%playa\%cold grasslanddry farmland≈dry grasslandfixed dunedesertified grasslandshifted duneeroded land, while the \{\{\}137Cs\} inventory of different land types is in the order of \%playa\%woodlandshifting dunecold grasslanddry farmland≈dry grasslandfixed dunedesertified grasslanderoded land. The \{\{\}137Cs\} distribution in the soil profile can be divided into four types of normal profile, aggrading profile, eroding profile and disturbed profile. The cold grassland that maintained the relatively perfect normal profile of original \{\{\}137Cs\} fallout can be regarded as ideal sampling site of \{\{\}137Cs\} reference.