干旱及种内竞争胁迫对树体电指标影响的研究-林业科学研究.PDF

2007, 22( 1) : 105~ 110 Forest R esearch : 100 11498( 2007) 010 10506 梁 军, 屈智巍, 贾秀贞, 刘惠文, 张星耀* ( 1. , , 100091) : , 3, ( SOD) , ( M DA ) ; ; 9 15 d, , : ; ; ; ; : S712 : A Influence of Drought and Intraspecific Competition on Trees∀ Electrical Indexes L IAN G Jun, QU Z h iw e,i JIA X iuzh en, L IU H u iw en, ZHAN G X ing y ao ( 1. Research nstitu te of Forest Ecology, E nvironm ent and P rotect ion, CAF; K ey Laboratory and Forest Protection, State Forestry Adm in istration, Beijing 100091, Ch ina) Abstract:T he results show ed that the trends of decrease of act iv ity of SOD and increase of content ofMDA and so lu b le sugar of all the treatm entsw ere observed from the third day after the cutt ings ofP op u us tom entosa to be applied w ith drought stress. The trends of decrease of tree stem capac itance and increase of tree stem mi pedance w ere show ed on sligh t and severe drought treatm ents from the th ird day after applied drought stress, wh ile the smi ilar changes w ere observed on the contro l from the n in th day. Under intraspec ific com petit ion, the stem diam eter, he ight, tree stem capacitance and unit capac itance of h igh density treatm en tw ere sign ificantly low er than that of low density treatm ent, w hile the tree stem mi pedancew as sign if icantly higher than that of low density treatm ent. The re search of tree stem capacitance and mi pedance and unit capac itancewould provide a theoretical basis for the quan ti tative assessm ent of the degree of dam age caused by env ironm enta l stresses. Key words: tree stem capacitance; tree stem mi pedance; un it capacitance; drough t stress; in traspec if ic competition , ,