东北林业大学学报
東北林業大學學報
동북임업대학학보
JOURNAL OF NORTHEAST FORESTRY UNIVERSITY
2014年
8期
46-51
,共6页
阔叶红松林%林隙%光量子通量密度
闊葉紅鬆林%林隙%光量子通量密度
활협홍송림%림극%광양자통량밀도
Mixed broad-leaved Korean pine forest%Forest gap%Photosynthetic photon flux densities (DPPF)
以小兴安岭阔叶红松林林隙为研究对象,在对其形状和大小进行量化的基础上,对林隙内及其附近林分的光量子通量密度(DPPF)进行了连续的定位观测,分析了其时空分异特征。结果表明:3个不同大小林隙的面积分别为G1(528.13 m2)、G2(295.17 m2)、G3(83 m2),形状指数分别为1.524、1.455、2.146。每个林隙中心及林隙边缘各点光量子通量密度均为单峰型的日变化,呈南-北、东-西方向上的不对称分布。各时刻光量子通量密度的大小顺序分别为DPPF G1>DPPF G2>DPPF G3。3个不同大小林隙光量子通量密度最大值出现的时间和空间均存在差异。各林隙中心月平均光量子通量密度与林外光量子通量密度的比例分别为59.46%、35.34%、17.71%,林内和林隙有显著的季节性变化。林隙光量子通量密度在时间和空间上的变化是一个复杂的过程,由于林隙面积、形状和所处地理位置等的不同,各地观测结果不尽一致,探讨其时空分布特征需要进行长期深入连续的观测。
以小興安嶺闊葉紅鬆林林隙為研究對象,在對其形狀和大小進行量化的基礎上,對林隙內及其附近林分的光量子通量密度(DPPF)進行瞭連續的定位觀測,分析瞭其時空分異特徵。結果錶明:3箇不同大小林隙的麵積分彆為G1(528.13 m2)、G2(295.17 m2)、G3(83 m2),形狀指數分彆為1.524、1.455、2.146。每箇林隙中心及林隙邊緣各點光量子通量密度均為單峰型的日變化,呈南-北、東-西方嚮上的不對稱分佈。各時刻光量子通量密度的大小順序分彆為DPPF G1>DPPF G2>DPPF G3。3箇不同大小林隙光量子通量密度最大值齣現的時間和空間均存在差異。各林隙中心月平均光量子通量密度與林外光量子通量密度的比例分彆為59.46%、35.34%、17.71%,林內和林隙有顯著的季節性變化。林隙光量子通量密度在時間和空間上的變化是一箇複雜的過程,由于林隙麵積、形狀和所處地理位置等的不同,各地觀測結果不儘一緻,探討其時空分佈特徵需要進行長期深入連續的觀測。
이소흥안령활협홍송림림극위연구대상,재대기형상화대소진행양화적기출상,대림극내급기부근림분적광양자통량밀도(DPPF)진행료련속적정위관측,분석료기시공분이특정。결과표명:3개불동대소림극적면적분별위G1(528.13 m2)、G2(295.17 m2)、G3(83 m2),형상지수분별위1.524、1.455、2.146。매개림극중심급림극변연각점광양자통량밀도균위단봉형적일변화,정남-북、동-서방향상적불대칭분포。각시각광양자통량밀도적대소순서분별위DPPF G1>DPPF G2>DPPF G3。3개불동대소림극광양자통량밀도최대치출현적시간화공간균존재차이。각림극중심월평균광양자통량밀도여림외광양자통량밀도적비례분별위59.46%、35.34%、17.71%,림내화림극유현저적계절성변화。림극광양자통량밀도재시간화공간상적변화시일개복잡적과정,유우림극면적、형상화소처지리위치등적불동,각지관측결과불진일치,탐토기시공분포특정수요진행장기심입련속적관측。
After quantifing the shape and size of different size forest gaps in the mixed broad-leaved Korean pine forest in Xiaox-ing’an Mountains and measuring the photosynthetic photon flux densities (DPPF) in and around gaps, we studied the spa-tial and temporal distribution characteristics of DPPF.The area was G1 (528.13 m2), G2 (295.17 m2), and G3 (83 m2). The shape indexes were 1.524, 1.455 and 2.146, respectively.The diurnal variations of DPPF at the center edge of the three gaps presented a single peak curve , DPPF distribution was dissymmetry in the orientations of south-north and east-west.The value order of DPPF at each corresponding moment was G 1>G2>G3.The maximum DPPF of spatial and temporal appeared variation in different position in three gaps.The mean monthly DPPF of the center to the outside of G1, G2 and G3 were 59.46%, 35.34%and 17.71%, respectively.There was pronounced seasonal variation of DPPF in the forest and gaps sites.Spatial and temporal variation of DPPF was complex process, affected by the gap size, shape and topography, and the gap location. Therefore, we should take further long-term search and continuous observation on the spatial and temporal distribution characteristics of light .