草业学报
草業學報
초업학보
PRATACULTURAL SCIENCE
2009年
6期
105-112
,共8页
土地利用方式%有机碳%全氮%地下生物量%土壤颗粒组分
土地利用方式%有機碳%全氮%地下生物量%土壤顆粒組分
토지이용방식%유궤탄%전담%지하생물량%토양과립조분
land-use type%organic carbon%total nitrogen%underground biomass%soil particle size
以位于青海湖北岸的围栏封育草地、围栏放牧草地、多年生人工草地和农田4种土地利用方式为研究对象,对0～10,10～20和20～30 cm三个土层的地下生物量、土壤颗粒组分、土壤有机碳和全氮含量分别进行了比较研究.结果表明,不同土地利用方式样地间土壤有机碳、全氮储量产生了较明显的差异.0～30 cm深度土体单位面积有机碳储量由高到低依次为:多年生人工草地＞围栏封育草地＞围栏放牧草地＞农田,多年生人工草地显著高于农田(P＜0.05),而另外2个样地间差异不显著(P＞0.05);0～30 cm深度全氮储量与有机碳储量变化趋势相似.4种土地利用方式相比较,0～30 cm土体内地下生物量由高到低依次为围栏封育＞围栏放牧＞多年生人工草地＞农田,分别为2 416.67,1 688.25,1 224.50和1 290.75 g/m~2.0～10 cm土层土壤粘粒含量以多年生人工草地最高,并显著高于其他3种土地利用方式(P＜0.05);10～20 cm土层土壤粘粒含量由大到小依次为:多年生人工草地＞农田＞围栏封育草地＞围栏放牧草地;20～30 cm土层的土壤粘粒含量无显著差异.同一土层各土地利用方式间粉粒含量均差异不显著(P＞0.05).
以位于青海湖北岸的圍欄封育草地、圍欄放牧草地、多年生人工草地和農田4種土地利用方式為研究對象,對0～10,10～20和20～30 cm三箇土層的地下生物量、土壤顆粒組分、土壤有機碳和全氮含量分彆進行瞭比較研究.結果錶明,不同土地利用方式樣地間土壤有機碳、全氮儲量產生瞭較明顯的差異.0～30 cm深度土體單位麵積有機碳儲量由高到低依次為:多年生人工草地＞圍欄封育草地＞圍欄放牧草地＞農田,多年生人工草地顯著高于農田(P＜0.05),而另外2箇樣地間差異不顯著(P＞0.05);0～30 cm深度全氮儲量與有機碳儲量變化趨勢相似.4種土地利用方式相比較,0～30 cm土體內地下生物量由高到低依次為圍欄封育＞圍欄放牧＞多年生人工草地＞農田,分彆為2 416.67,1 688.25,1 224.50和1 290.75 g/m~2.0～10 cm土層土壤粘粒含量以多年生人工草地最高,併顯著高于其他3種土地利用方式(P＜0.05);10～20 cm土層土壤粘粒含量由大到小依次為:多年生人工草地＞農田＞圍欄封育草地＞圍欄放牧草地;20～30 cm土層的土壤粘粒含量無顯著差異.同一土層各土地利用方式間粉粒含量均差異不顯著(P＞0.05).
이위우청해호북안적위란봉육초지、위란방목초지、다년생인공초지화농전4충토지이용방식위연구대상,대0～10,10～20화20～30 cm삼개토층적지하생물량、토양과립조분、토양유궤탄화전담함량분별진행료비교연구.결과표명,불동토지이용방식양지간토양유궤탄、전담저양산생료교명현적차이.0～30 cm심도토체단위면적유궤탄저량유고도저의차위:다년생인공초지＞위란봉육초지＞위란방목초지＞농전,다년생인공초지현저고우농전(P＜0.05),이령외2개양지간차이불현저(P＞0.05);0～30 cm심도전담저량여유궤탄저량변화추세상사.4충토지이용방식상비교,0～30 cm토체내지하생물량유고도저의차위위란봉육＞위란방목＞다년생인공초지＞농전,분별위2 416.67,1 688.25,1 224.50화1 290.75 g/m~2.0～10 cm토층토양점립함량이다년생인공초지최고,병현저고우기타3충토지이용방식(P＜0.05);10～20 cm토층토양점립함량유대도소의차위:다년생인공초지＞농전＞위란봉육초지＞위란방목초지;20～30 cm토층적토양점립함량무현저차이.동일토층각토지이용방식간분립함량균차이불현저(P＞0.05).
Four different land-use types, fenced and ungrazed (FU), fenced and seasonal grazed (FG), perennial pasture (PP) and crop land (CL) in the Sanjiao Cheng Sheep Breeding Farm located in the northeastern part of Qinghai Lake, were used to investigate underground biomass, soil particle size, soil organic carbon and total nitrogen contents of the 0-10, 10-20, 20-30 cm soil layers. Soil organic carbon and total nitrogen storage were different under different land-use types. The storage of soil organic carbon per unit area varied in the order of PP>FU>FG>CL. The soil organic carbon in the perennial pasture was significantly (P<0.05) higher than that in cropland, but no significant difference was found between the other two types (P>0.05). The changes of total nitrogen were similar to those of organic carbon. In the 0-30 cm soil depth, the underground biomass varied in the order FU>FG>PP>CL, with values of 2 416.67, 1 688.25, 1 224.50, and 1 290.75 g/m~2 respectively. In the 0-10 cm soil layer the soil clay content of PP was significantly (P<0.05) higher than in the other three types. The soil clay content of the 10-20 cm soil layer was in the order PP>CL>FU>FG. No significant differences in soil clay contents were found in the 20-30 cm soil layer under different land-use types. The soil silt contents of the four different land-use types were not significantly different in the same soil layer.
