Light environment characteristics of forest gap in deciduous broad leaved forest and its effects on growth features of Gynostemma pentaphyllum in Jianghuai watershed

Abstract

Abstract: The daily total light intensity, various wave band light intensities, spectrum composition, and the growth characteristics and total saponia content of Gynostemma pentaphyllum in forest gap and under forest were studied in deciduous forest (Liquidambar formosana) in Jianghuai watershed. The results showed that the intensities of full wavelength daily total light, blue light(400～510 nm), yellow green light(510～610 nm), red orange light (610～720 nm)and near infrared light(720～1100 nm) in forest gap were higher than those under forest.The intensities and spectra compositions of blue light and red orange light in forest gaps were significantly higher than those under forest. Additionally, the differences between those in forest gap and under forest varied seasonally. The relative intensity of blue light in April, July and October in forest gap was 8.32%～28.83%,30.00%～579.17% and 6.70%～88.74% more than those under forest,respectively,and that of red orange light in April, July and October in forest gap was 8.72%～28.83%,30.19%～502.69%,6.76%～91.57% more than those under forest,respectively.The spectrum composition of blue light in forest gap in these 3 months was 5.76%,33.14% and 17.29% higher than those under forest,respectively, and that of red orange light in forest gap in these 3 months was 5.04%,53.34% and 10.23% higher than those under forest,respectively. The net photosynthetic rate, total dry matter weight, and total saponia content of Gynostemma pentaphyllum growing in forest gap were higher than those under forest. Gynostemma pentaphyllum growing in forest gap had more dry matter distributed in stem.The results could be available to utilize the light environment of deciduous broad leaved forest and further building comprehensive management model of Gynostemma pentaphyllum in Jianghuai watershed zone.

CLC Number:

S718.52

WEI Chaoling, SUN Qixiang, PENG Zhenhua, YAN Dawei. Light environment characteristics of forest gap in deciduous broad leaved forest and its effects on growth features of Gynostemma pentaphyllum in Jianghuai watershed[J]. Chinese Journal of Applied Ecology, 2003, (5): 665-670.

References

[1] Augspurger CK.1984.Light requirements of neo-tropical tree seeding:a comparative study of growth and survival.J Ecol,72:777～795
[2] Ban Y(班勇).1996.Natural disturbance and dynamics of forest canopy gap.Chin J Ecol(生态学杂志),15(3):43～49(in Chinese)
[3] Chazdon RL,FetcherN.1984.Photosynthetic light environments in a low land tropical rain forest in Costa Rica.J Ecol,72:553～564
[4] Canham CD.1990.Light regimes beneath closed canopies and tree-fallgaps in temperature and tropical forests.Can J Fore Res,20:620～631
[5] Canham CD.1988.An index for understory light levels in and around canopy gaps.Ecology,69(3):786～795
[6] Geng Y-Q(耿玉清),San H-C(单宏臣),Tan X(谭笑),et al.2002.Soils in forest gaps in artificial coniferous forest.J Beijing For Univ(北京林业大学学报),24(4):16～19(in Chinese)
[7] Liu J-Y(刘静艳),Wang-B-S(王伯荪),Zang R-G(臧润国).1999.Gap formation and its characteristics in south subtropical evergreen broadleaved forest.Chin J Appl Ecol(应用生态学报),10(4):385～388(in Chinese)
[8] Liu W-J(刘文杰),Li Q-J(李庆军),Zhang G-M(张光明),et al.2000.The microclimatic differences between and within canopy gaps in the dry-hot season in Shorea chinensis forest.Acta Ecol Sin(生态学报),20(6):932～937(in Chinese).
[9] Li C-H(李纯),Hu Y-H(胡颖蕙).1993.Study on method about determination of total saponin from Gynostemma pentaphyllum.J Nanjing Univ(南京大学学报),29(supp.):35～40(in Chinese)
[10] Peng S-L(彭少麟).1996.Dynamics of forest community in the south of sub-tropical zone.Beijing:SciencePress.(in Chinese)
[11] Shen Y-G(沈允钢),Wang T-D(王天铎).1978.Photosynthesis-from mechanism to agriculture.Shanghai:Shanghai Science and Technology Press.(in Chinese)
[12] Thomas LP,William JP.1989.Gap light regimes in fluence canopy tree diversity.Ecology,70(3):553～555
[13] Whitmore TC.1978.Gaps in the forest canopy.In:Tomlinson PB,Zimmermann MH eds.Tropical Trees-An Living Systems.New York:Cambridge University Press.639～655
[14] Wu L(吴宁).1999.Dynamics of forest in subalpine coniferous forests on the eastern slope of Gongga mountain.Acta Phytoecol Sin(植物生态学报),23(3):228～237(in Chinese)
[15] Wang J-X(王进欣),Zhang Y-P(张一平),Ma Y-X(马友鑫),et al.2000.Linear character of the sunshine of the gap in the artificial forest in Xishuangbanna.Plant Resour Environ(植物资源与环境),9(1):27～30(in Chinese)
[16] Wu Z-M(吴泽民),Huang H-L(黄成林),Wei H-L(韦朝领).2000.Light effect of gaps in Huangshan pine community and regeneration of Huangshan pine.Chin J Appl Ecol(应用生态学报),11(1):13～18(in Chinese)
[17] Xia B(夏冰),Deng F(邓飞),He H-A(贺善安).1997.Advances on the forest gap studies.J Plant Resour Environ(植物资源与环境),6(4):50～57(in Chinese)
[18] Zang R-G(臧润国),Xu H-C(徐化成).1998.Advances in forest gap disturbance research.Sci Silvae Sin(林业科学),34(1):90～98(in Chinese)
[19] Zhang Y-H(张艳华),Lie H-Q(聂绍荃),Wang H-X(王志西).1999.The influence of gaps on the herb.Bull Bot Res(植物研究),19(1):94～99(in Chinese)
[20] Zhang Y-P(张一平),Wang J-X(王进欣),Liu Y-H(刘玉洪),et al.2001.Study on the sun-shine characteristics of the tropical secondary forest gap in the dry-hot season in Xishuangbanna.Guihaia(广西植物),21(1):1～8(in Chinese)