Ecophysiological characteristics of three native species used in two forest reconstructing models

Abstract

Abstract: It is of importance to utilize native species to reconstruct forest.Three native species of Acronychia pedunculata,Castanopsis hystrix and Michelia macclurei were respectively planted in man-made gaps and under Acacia mangium forest which was cut evenly at fifty percent.Their physiological characteristics such as chlorophyll content,net photosynthetic rate (Pn),transpiration rate (Tr),stamatal conductance (Gs),and water use efficiency (WUE) were measured.The results showed that there were higher photosynthetically active radiation (PAR) and relative humidity (RH) of air,and lower air temperature (T air) in gaps than under forest canopy layer.The leaves of 3 tree species in gaps were smaller and thicker,and the dry mass per unit area and chlorophyll content of leaves were much higher in gaps than under the canopy layer.In winter,the daily changes of Pn of A.pedunculata and C.hystrix showed single-peaked curve model in gaps and under canopy layer,while that of M.macclurei showed bimodal curve model in gaps and single-peaked curve model under canopy layer.The daily changes of Tr in leaves of the 3 species all showed single-peaked curve.Similar tendency in daily Gs of the 3 species in gaps and under canopy layer was shown,which was similar to the daily tendency of PAR and reverse to the RH.The WUE of A.pedunculata and C.hystrix were higher in gaps than those under canopy layer,while that of M.macclurei was reverse with no significant difference.In summer,all the 3 species had similar changes in Pn to that of the winter.The Tr of C.hystrix and A.pedunculata were higher in gaps than under canopy layer,while that of M.macclurei under canopy layer was higher than that in gaps.The tendency of Gs of the 3 species in summer was also similar to that of PAR,and reverse to that of RH.The WUE of A.pedunculata and M.macclurei were higher in gaps than under canopy layer,while that of C.hystrix were reverse.The WUE of M.macclurei was the highest among the 3 species in winter or summer,and that of the 3 species were all higher in winter than in summer.It could be concluded that A.pedunculata and C.hystrix grew better under the canopy layer and M.macclurei grew better in gaps.

Key words: Earthworm activity, Red soil, Phosphorus fraction, Phosphorus availability

CLC Number:

S756

CAI Xi'an, PENG Shaolin, ZHAO Ping, LIU Hui, RAO Xinquan . Ecophysiological characteristics of three native species used in two forest reconstructing models[J]. cje, 2005, (3): 243-250.

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