草业学报
草業學報
초업학보
PRATACULTURAL SCIENCE
2015年
8期
211-217
,共7页
胡静%侯向阳%萨茹拉%郭丰辉%丁勇
鬍靜%侯嚮暘%薩茹拉%郭豐輝%丁勇
호정%후향양%살여랍%곽봉휘%정용
羊草%构件特征%个体地上生物量%典型草原
羊草%構件特徵%箇體地上生物量%典型草原
양초%구건특정%개체지상생물량%전형초원
Leymus chinensis%module characteristics%individual above-ground biomass%typical steppe
生物量是评价草原生态系统生产力的重要指标,草原主要植物个体地上生物量估算模型的建立,可为采用非刈割方法获取较准确的草原地面数据资料提供新方法。通过分析内蒙古典型草原植物羊草的主要构件特征(叶片数、叶长宽积、茎粗、茎高和株高)与其个体地上生物量之间的关系,比较并筛选出能较好预测羊草个体生物量变化的构件指标,采用 Minitab 软件的回归分析方法,分别利用6月、7月和8月采集的90株和总体270株羊草植物样本,建立羊草不同生长阶段(生长初期、生长旺盛期和生长末期)以及总体样本的个体地上生物量估算方程,并对实测值与模拟值进行 t 检验分析。结果表明,叶长宽积和株高相对于其他构件信息能够更好地描述羊草个体地上生物量,方程Y =-0.193+0.009X 2+0.011X 5(X 2为叶长宽积,X 5为株高,P <0.01,R 2=0.854)为最优羊草个体生物量估算模型。
生物量是評價草原生態繫統生產力的重要指標,草原主要植物箇體地上生物量估算模型的建立,可為採用非刈割方法穫取較準確的草原地麵數據資料提供新方法。通過分析內矇古典型草原植物羊草的主要構件特徵(葉片數、葉長寬積、莖粗、莖高和株高)與其箇體地上生物量之間的關繫,比較併篩選齣能較好預測羊草箇體生物量變化的構件指標,採用 Minitab 軟件的迴歸分析方法,分彆利用6月、7月和8月採集的90株和總體270株羊草植物樣本,建立羊草不同生長階段(生長初期、生長旺盛期和生長末期)以及總體樣本的箇體地上生物量估算方程,併對實測值與模擬值進行 t 檢驗分析。結果錶明,葉長寬積和株高相對于其他構件信息能夠更好地描述羊草箇體地上生物量,方程Y =-0.193+0.009X 2+0.011X 5(X 2為葉長寬積,X 5為株高,P <0.01,R 2=0.854)為最優羊草箇體生物量估算模型。
생물량시평개초원생태계통생산력적중요지표,초원주요식물개체지상생물량고산모형적건립,가위채용비예할방법획취교준학적초원지면수거자료제공신방법。통과분석내몽고전형초원식물양초적주요구건특정(협편수、협장관적、경조、경고화주고)여기개체지상생물량지간적관계,비교병사선출능교호예측양초개체생물량변화적구건지표,채용 Minitab 연건적회귀분석방법,분별이용6월、7월화8월채집적90주화총체270주양초식물양본,건립양초불동생장계단(생장초기、생장왕성기화생장말기)이급총체양본적개체지상생물량고산방정,병대실측치여모의치진행 t 검험분석。결과표명,협장관적화주고상대우기타구건신식능구경호지묘술양초개체지상생물량,방정Y =-0.193+0.009X 2+0.011X 5(X 2위협장관적,X 5위주고,P <0.01,R 2=0.854)위최우양초개체생물량고산모형。
Biomass is an important component of grassland ecosystem productivity.Models able to describe the productivity of the main plant species in grassland offer the potential to estimate aboveground biomass without physical cutting.In this research the relationships among plant characteristics (leaf number,leaf length×leaf width,stem diameter,stem height and plant height)and individual above-ground biomass was analyzed,sub-sequently those characteristics able to best predict changes of individual above-ground biomass were selected for modelling.Ninety Leymus chinensis plants were sampled in June (early growing season),July (middle grow-ing season)and August (late growing season),respectively,and total of 270 observations were used to build models able to estimate individual plant above-ground biomass.Equations were obtained using regression anal- <br> ysis using Minitab 16.0,and T-Test analysis was used to compare observed and predicted values.The results showed that leaf length × leaf width and plant height could describe individual above-ground biomass of L. chinensis plants;model Y =-0.193 +0.009X 2 +0.011X 5 (X 2 indicated leaf length×leaf width,X 5 indicated plant height,P <0.01,R 2 =0.854).