CAJ | 학술논문

以13年生‘3113’板栗为试验对象，在河北省迁西县板栗种植园内两种主栽密度下（密度Ⅰ，株行距3 m×4 m；密度Ⅱ，株行距4 m×6 m）分别进行3种修剪强度试验，分别是P1、P2、P3，每平米树冠投影面积留母枝数为8、10、12个；测定了板栗冠层不同部位叶片的叶绿素质量分数、比叶质量和光合特征（净光合速率、蒸腾速率和瞬时水分利用效率）。结果表明：两密度中冠层各部位叶绿素质量分数均随着修剪强度的增加而降低；由小到大的顺序均表现为P1、P2、P3。密度Ⅰ中比叶质量、净光合速率与蒸腾速率均随着修剪强度的增加而增加，由大到小的顺序为P1、P2、P3；密度Ⅱ冠层各部位比叶质量最高值均出现在P2中，达到了140．55 g· m－2，在冠层上部P2净光合速率和蒸腾速率显著高于P1、P3。瞬时水分利用效率差异较小，密度Ⅰ中P1冠层中部与内膛最低，其他部位无差异；密度Ⅱ中，除内膛无差异外，P3显著高于其他两个处理。
이13년생‘3113’판률위시험대상，재하북성천서현판률충식완내량충주재밀도하（밀도Ⅰ，주행거3 m×4 m；밀도Ⅱ，주행거4 m×6 m）분별진행3충수전강도시험，분별시P1、P2、P3，매평미수관투영면적류모지수위8、10、12개；측정료판률관층불동부위협편적협록소질량분수、비협질량화광합특정（정광합속솔、증등속솔화순시수분이용효솔）。결과표명：량밀도중관층각부위협록소질량분수균수착수전강도적증가이강저；유소도대적순서균표현위P1、P2、P3。밀도Ⅰ중비협질량、정광합속솔여증등속솔균수착수전강도적증가이증가，유대도소적순서위P1、P2、P3；밀도Ⅱ관층각부위비협질량최고치균출현재P2중，체도료140．55 g· m－2，재관층상부P2정광합속솔화증등속솔현저고우P1、P3。순시수분이용효솔차이교소，밀도Ⅰ중P1관층중부여내당최저，기타부위무차이；밀도Ⅱ중，제내당무차이외，P3현저고우기타량개처리。
We selected 13 year old Castanea mollissima‘3113’ with two main cultivate densities ( I:spacing of 3 m×4 m;II:spacing of 4 m×6 m) in Qianxi chestnut plantation of Hebei Province.Three pruning intensity treatments (8, 10, 12 bien-nial bearing branches per square meter of crown projection area) were set up on each density, donated as P1, P2, P3.In order to explain the impact of pruning on leaves from the physiological characteristics, we measured chlorophyll content, leaf mass per area, photosynthetic rate, transpiration rate and instantaneous water use efficiency in different crown.The chlorophyll content is decreased with the increase of pruning intensity in any part of the crown in two densities, P1<P 2<P3.Leaf mass per area, photosynthetic rate and transpiration rate increased with the increase of pruning intensity in density I, P1>P2>P3, the designed maximum of leaf mass per area was in the whole crown, which reached 140.55 g· m-2 in up-per crown in P2 of density II.Photosynthetic rate and transpiration rate in upper crown of P2 were significantly higher than P1 and P3.There was no difference between three pruning intensities but the middle crown in P2 in density I.P3 was sig-nificantly higher than P1 and P2 except inner crown in density II.