摘要
在甘肃陇中黄土高原地区,研究了扁蓿豆(Medicago ruthenica)与无芒雀麦(Bromus inermis)以不同混播比例(0∶10、2∶8、3∶7、4∶6、5∶5、6∶4、7∶3、8∶2、10∶0)建植对播种当年草地土壤养分含量及酶活性的影响,并用灰色关联度分析法进行综合评价。结果表明,混播比例对于表层土壤养分含量及酶活性影响显著,对深层土壤影响不显著。10~20 cm土层,豆禾比5∶5处理的速效磷含量较CK1增加了38%,酶活性差异不显著(P>0.05)。20~40 cm土层,豆禾比8∶2处理的碱解氮含量较CK2和CK1分别增加了159%和115%(P<0.05)。相关性分析和主成分分析可知,扁蓿豆-无芒雀麦混播草地土壤养分含量与酶活性之间具有一定的相关性,且二者共同决定土壤肥力水平。综合评价认为,扁蓿豆与无芒雀麦混播比例为5∶5时,对土壤肥力的改善效果最好,为陇中黄土高原地区推荐种植比例。
The effects of planting of Medicago ruthenica and Bromus inermis in different mixture ratios(0∶10,2∶8,3∶7,4∶6,5∶5,6∶4,7∶3,8∶2,10∶0)on soil nutrient content and enzyme activity of grassland in the year of sowing were studied in the Loess Plateau region of Longzhong,Gansu Province.The results showed that mixture ratio had significant effects on nutrient contents and enzyme activities in the surface layer of soil,but had no significant effect on deep soil.In the 10~20 cm soil layer,the available phosphorus content of mixture ratio 5∶5 treatment increased by 38%compared to CK1.In the 20~40 cm layer,the alkail-hydrolyzable nitrogen content of mixture ratio 8∶2 treatment increased by 159%and 115%compared to CK2and CK1,respectively(P<0.05).The correlation and principal component analysises revealed that there was a correlation between soil nutrient contents and enzyme activities in the mixed grassland,and both factors can determine the soil fertility level.In conclusion,the optimum improvement of soil fertility was achieved by planting of M.ruthenica and B.inermis in mixture ratio 5∶5,which was the recommended in the Loess Plateau area of Longzhong.
作者
魏孔涛
鱼小军
白梅梅
马凯凯
刘耀峰
张选明
WEI Kongtao;YU Xiaojun;BAI Meimei;MA Kaikai;LIU Yaofeng;ZHANG Xuanming(College of Pratacultural Science,Gansu Agricultural University/Key Laboratory of Grassland Ecosystem,Ministry of Education/Sino-U.S.Centers for Grazingland Ecosystem Sustainability,Lanzhou 730070,China;Animal Husbandry and Veterinary Technical Service Center,Longxi County,Dingxi 748100,China;Technology Innovation Center of Artificial Grassland Construction in Arid Area of Loess Plateau,Dingxi City,Dingxi 748100,China;Yurun Agriculture and Animal Husbandry Company Limited,Longxi County,Dingxi 748100,China)
出处
《中国草地学报》
CSCD
北大核心
2023年第2期56-66,共11页
Chinese Journal of Grassland
基金
国家牧草产业技术体系(CARS-34-01A)。
关键词
黄土高原
人工草地
混播比例
土壤养分
土壤酶活性
Loess Plateau
Artificial grassland
Mixture ratio
Soil nutrient
Soil enzyme activity
