摘要
在东北三江平原放牧季6月中旬～9月中旬,设置3个放牧强度即轻度(0.87头牛/hm2),中度(1.42头牛/hm2)和重度(1.94头牛/hm2),以不放牧作为对照,观测不同放牧强度对小叶章草地土壤物理性状和速效养分变化的影响。2010年放牧结果表明:放牧对土壤浅层物理性状产生影响,对土壤深层性状影响微弱。重度放牧强度下土壤含水量0～10cm最低,为42.84%,并与其他放牧处理产生差异(P<0.05);放牧对土壤容重的影响主要体现在0～5cm的土层,与对照相比放牧处理对土壤容重略有增加趋势,放牧对土壤深层容重不能产生显著影响(P>0.05);家畜对土壤有夯实作用,土壤孔隙度随放牧强度增加而降低,重度放牧土壤孔隙度最低,与对照相比降10.8%并与其产生显著差异(P<0.05)。放牧对土壤速效养分的影响表现在,重度放牧降低0～10cm的土层速效氮含量,其他放牧强度对小叶章草地土壤速效氮的影响微弱,各放牧处理间差异不显著(P>0.05);不同放牧强度与对照相比对速效磷含量影响微弱;土壤速效钾含量随放牧强度增加而降低,轻度、中度、重度分别较对照下降1.72%,3.8%和8.2%,但差异不显著(P>0.05),表明放牧对小叶章草地土壤速效养分含量影响微弱。
In Sanjiang plain,the effects of different stocking rates （continuous grazing： light grazing,0.87 cattle/ha,LG;moderate grazing,1.42 cattle/ha,MG;heavy grazing,1.94 cattle/ha,HG;zero grazing as CK） on grassland soil were studied in 2010 and the grazing period was between mid-June and mid-September. The results showed that the impact of grazing on upper layer soil was stronger than deeper layer soil. The soil moisture in HG was the lowest （0-10 cm,42.84%） and the difference with other treatments was significant （P〈0.05）. The soil bulk density within 0-5 cm soil increased under grazing and no significant impact in deeper layer soil. The soil porosity was increased by 10.8% under HG compared with CK （P〈0.05）. The content of soil availa- ble nitrogen in 0-10 cm layer was reduced under HG （P〈0.05） and this was not significant compared with for other grazing treatments. No significant impact was found for soil available P. With grazing intensity increased, the contents of soil available K were decreased by 1.72%, 3.8% and 8.2% in LG, MG and HG respectively compared with CK （P〉0.05）.
出处
《草原与草坪》
CAS
2013年第1期5-10,共6页
Grassland and Turf
基金
公益性行业(农业)科研专项经费(200903060)资助
关键词
三江平原
小叶章草地
物理性状
速效养分
Sanjiang Plain
Deyeuxia angustifolia
soil physical properties
available nutrient
