草原与草坪
草原與草坪
초원여초평
GRASSLAND AND TURF
2015年
4期
32-36
,共5页
小嵩草草甸草原%退化草地%生物量%土壤全量养分%土壤有效养分
小嵩草草甸草原%退化草地%生物量%土壤全量養分%土壤有效養分
소숭초초전초원%퇴화초지%생물량%토양전량양분%토양유효양분
Kobresia pygmaea meadow steppe%degraded meadow%biomass%soil total nutrients%soil available nutrients
以西藏安多县原生小嵩草(Kobresia pygmaea )草甸草原与退化小嵩草草甸草原2种类型草地为研究对象,对其草地的地上和地下生物量、土壤的有机碳、全氮、全磷、有效氮和有效磷含量进行研究,了解退化对草地植物生物量和基本养分含量的影响。结果表明,退化小嵩草草甸草原的地上、地下以及总生物量均显著下降,地上0~10、10~20 cm 土层生物量和总生物量分别相当于小嵩草草甸草的80.9%、22.1%,15.8%和20.0%；2种类型草地土壤的全量和有效碳氮磷含量均较低,退化对土壤全量和有效养分的影响并不一致,退化导致0~10和10~20 cm 土层的有机碳、全氮和全磷含量均显著升高,而导致0~10和10~20 cm 土层的有效氮和有效磷含量均显著降低,2种类型草地随着土层的加深,土壤有机碳、全氮、全磷、有效氮和有效磷含量没有明显差异。
以西藏安多縣原生小嵩草(Kobresia pygmaea )草甸草原與退化小嵩草草甸草原2種類型草地為研究對象,對其草地的地上和地下生物量、土壤的有機碳、全氮、全燐、有效氮和有效燐含量進行研究,瞭解退化對草地植物生物量和基本養分含量的影響。結果錶明,退化小嵩草草甸草原的地上、地下以及總生物量均顯著下降,地上0~10、10~20 cm 土層生物量和總生物量分彆相噹于小嵩草草甸草的80.9%、22.1%,15.8%和20.0%；2種類型草地土壤的全量和有效碳氮燐含量均較低,退化對土壤全量和有效養分的影響併不一緻,退化導緻0~10和10~20 cm 土層的有機碳、全氮和全燐含量均顯著升高,而導緻0~10和10~20 cm 土層的有效氮和有效燐含量均顯著降低,2種類型草地隨著土層的加深,土壤有機碳、全氮、全燐、有效氮和有效燐含量沒有明顯差異。
이서장안다현원생소숭초(Kobresia pygmaea )초전초원여퇴화소숭초초전초원2충류형초지위연구대상,대기초지적지상화지하생물량、토양적유궤탄、전담、전린、유효담화유효린함량진행연구,료해퇴화대초지식물생물량화기본양분함량적영향。결과표명,퇴화소숭초초전초원적지상、지하이급총생물량균현저하강,지상0~10、10~20 cm 토층생물량화총생물량분별상당우소숭초초전초적80.9%、22.1%,15.8%화20.0%；2충류형초지토양적전량화유효탄담린함량균교저,퇴화대토양전량화유효양분적영향병불일치,퇴화도치0~10화10~20 cm 토층적유궤탄、전담화전린함량균현저승고,이도치0~10화10~20 cm 토층적유효담화유효린함량균현저강저,2충류형초지수착토층적가심,토양유궤탄、전담、전린、유효담화유효린함량몰유명현차이。
Two types grassland,Kobresia pygmaea meadow steppe and degraded Kobresia pygmaea meadow steppe were selected to study the effect of alpine meadow degradation on biomass and soil nutrients,and the a-bove ground biomass,root biomass and soil organic carbon,total N,total P,available N and available P were de-termined.The results showed that the above ground,root and total biomass all decreased significantly,and the a-bove ground biomass,0~10 cm,10~20 cm and total biomass of the degraded grassland were 80.9%,22.1%, 15.8% and 20.0% of the Kobresia pygmaea meadow steppe respectively.The total and available nutrients of the two grassland types were all at a lower level.The effects of degradation on soil total nutrients and available nutrients were not consistent.Soil organic carbon,total N and total P in 0~10 cm and 10~20 cm soil depth both increased significantly,but the available N and available P in 0~10 cm and 10~20 cm soil depth both decreased significantly after degradation.In addition to total N in the degraded grassland,there were no significant differ-ence in soil organic carbon,total N,total P,available N and available P of different soil depth both the two grass-land types.
