青海草地早熟禾生长和根系特征对刈割强度的响应研究  

Study on response of the growth and root characteristics of Poa pratensis L.“Qinghai”to cutting intensity

作　　者：景美玲 马玉寿[2] 李鑫 徐腾 JING Meiling;MA Yushou;LI Xin;XU Teng(College of Eco-environment and Resources,Qinghai Nationalities University,Xining 810007,China;Qinghai Academy of Animal Science and Veterinary Medicine,Xining 810003,China)

机构地区：[1]青海民族大学生态环境与资源学院,西宁810007 [2]青海省畜牧兽医科学院,西宁810003

出　　处：《黑龙江畜牧兽医》2023年第2期98-103,共6页Heilongjiang Animal Science And veterinary Medicine

基　　金：青海省青年基金项目“青海草地早熟禾(Poa pratensis L.cv.Qinghai)无性生殖机理研究”(2019-ZJ-987Q)。

摘　　要：为研究青海草地早熟禾生长和根系特征对刈割强度的响应,试验采用随机区组设计,选取长势均匀的青海草地早熟禾人工草地,划分为12个小区,设置4种处理,分别为对照(CK,不进行任何处理)、轻度刈割(LC,留茬10 cm)、中度刈割(MC,留茬5 cm)、重度刈割(HC,留茬2 cm),每种处理3次重复,于2019年6月底和7月底各刈割1次,并分别于刈割30 d后测定各处理青海草地早熟禾的株高、生长速度、分蘖数、地上总生物量、地下生物量、根系特征(表面积、体积、直径)和地下芽数量。结果表明:6月底和7月底刈割后各处理株高的大小顺序均为CK>LC>MC>HC。6月底刈割后,各处理生长速度的大小顺序为CK>LC>MC>HC;7月底刈割后,各处理生长速度的大小顺序为LC>CK>MC>HC。6月底刈割后,各处理分蘖数大小顺序为LC>CK>MC>HC;7月底刈割后,各处理分蘖数大小顺序为CK>LC>MC>HC。6月底和7月底刈割后,各处理地上总生物量的大小顺序均为LC>CK>MC>HC。6月底和7月底刈割后,各处理地下生物量、禾根系表面积、根系体积的大小顺序均为CK>LC>MC>HC。6月底刈割后,各处理根系直径的大小顺序为LC>MC>HC>CK,但各处理根系直径均差异不显著(P>0.05);7月底刈割后,各处理根系直径的大小顺序为LC>CK>MC>HC。6月底刈割后,各处理地下芽数量大小顺序为LC>CK>MC>HC;7月底刈割后,各处理的地下芽数量大小顺序为LC>MC>CK>HC。青海草地早熟禾的株高与分蘖数、地上生物量、地下生物量、根系表面积、根系体积和地下芽数量均呈极显著正相关(P<0.01);分蘖数与地上生物量、地下生物量、根系表面积、根系体积、地下芽数量之间呈极显著正相关(P<0.01),与根系直径呈显著正相关(P<0.05);青海草地早熟禾的地上生物量与地下生物量、根系表面积、根系体积、地下芽数量呈极显著正相关(P<0.01);青海草地早熟禾的地下生物量与根系表面积、根系体积之间呈�In order to study the response of Poa pratensis L.“Qinghai”growth and root characteristics to cutting intensity,a randomized block design was used in the experiment.The Poa pratensis L.“Qinghai”artificial grassland with uniform growth in Qinghai was selected and divided into 12 plots.Four treatments were set up:control(CK,without any processing),mild cutting(LC,stubble 10 cm),moderate cutting(MC,stubble 5 cm),and heavy cutting(HC,stubble 2 cm).Each treatment was repeated three times.The aboveground biomass was performed once at the end of June and once at the end of July 2019.The plant height,growth rate,tillering number,aboveground biomass,underground biomass,root characteristics(surface area,volume,diameter)and underground bud number of bluegrass were measured 30 days after cutting.The results showed that the order of plant height in each treatment was CK>LC>MC>HC after cutting at the end of Jure and July.After cutting at the end of June,the order of growth rate in each treatment was CK>LC>MC>HC.After cutting at the end of July,the order of growth rate in each treatment was LC>CK>MC>HC.After cutting at the end of June,the order of tillering number in each treatment was LC>CK>MC>HC.After cutting at the end of July,the order of tillering number in each treatment was CK>LC>MC>HC.After cutting at the end of June and the end of July,the order of the total aboveground biomass in each treatment was LC>CK>MC>HC in each treatment.After cutting at the end of June and the end of July,the order of underground biomass,root surface area and root volume of bluegrass in each treatment was CK>LC>MC>HC in each treatment.After cutting at the end of June,the order of the root diameter in each treatment was LC>MC>HC>CK,but there was no significant difference among all treatments(P>0.05).After cutting at the end of July,the order of the root diameter in each treatment was LC>CK>MC>HC.After cutting at the end of June,the order of the number of underground buds in each treatment was LC>CK>MC>HC.After cutting at the end of July

关 键 词：青海草地早熟禾 刈割强度 根系特征 生长特性 生物量 

分 类 号：S812[农业科学—草业科学]