不同季节休牧对三江平原小叶章草甸土壤性状的影响  

Effects of grazing rest in different seasons on soil properties of Calamagrostis angustifolia meadow in the Sanjiang plain

作　　者：李钢[1,2] 王明君[1] 张风承[1] 刘冬伟[1] 史印涛 李佶恺[3] 崔国文[1] 邵明昌 

机构地区：[1]东北农业大学动物科学技术学院,哈尔滨150030 [2]黑龙江省绿色食品发展中心,哈尔滨150006 [3]黑龙江省农业科学院草业研究所,哈尔滨150086 [4]宝清县东升自然保护区管理局,黑龙江宝清155600

出　　处：《黑龙江畜牧兽医》2013年第1期77-80,共4页Heilongjiang Animal Science And veterinary Medicine

基　　金：公益性行业(农业)科研专项(200903060)

摘　　要：为了研究不同季节休牧对草地土壤的影响,试验在3个放牧强度下,分别采用春季、夏季和秋季休牧的方法,对三江平原小叶章草甸土壤理化性状进行了分析。结果表明:与放牧相比,不同季节休牧可以降低0～≤5 cm土层的土壤容重(P>0.05),增加>5～≤10 cm土层的土壤容重;春季、夏季和秋季休牧均能显著增加>10～≤20 cm土层土壤中的全氮含量(P<0.05);春季、夏季、秋季休牧均可以显著增加土壤中的铵态氮含量(P<0.05),秋季休牧还能增加土壤中的硝态氮含量;中度放牧强度下,夏季、秋季休牧可以显著增加土壤的速效磷含量(P<0.05);不同季节土壤速效钾含量变化较大,规律不明显。To investigate the effects of grazing rest in different seasons on the meadow soil, the physical and chemical properties of soil from Ca-lamagrostis angustifolia meadow in the Sanjiang plain were analyzed, by using grazing rest methods in three seasons （spring, summer and au- tumn） under three grazing intensities, respectively. The results showed that compared with grazing, grazing rest in different seasons could de- crease the soil bulk density in the 0 ~ ~〈5 em soil layer （ P 〉 0.05 ） , but could increase the soil bulk density in the 〉 5 ~ ~〈 10 cm soil lay-er. Grazing rest in spring, summer and autumn could significantly increase the total nitrogen content of the 〉 10 -≤20cm soil layer （P 〈 0.05 ） ; grazing rest in spring, summer and autumn could increase the content of ammonium nitrogen in the soil （ P 〈 0.05 ）. Grazing rest in au-tunm could increase the content of nitrate nitrogen in the soil. Under the moderate grazing intensity, grazing rest in summer and autumn could help to improve the content of available phosphorus in the soil （ p 〈 0.05 ）. The content of available potassium in the soil had larger changes in different seasons, and there was no evident regularity.

关 键 词：季节休牧 放牧 土壤性状 三江平原 

分 类 号：S812.8[农业科学—草业科学]