Leaf Traits and Allometric Growth Patterns of Camellia sinensis in Response to Pleioblastus amarus Expansion into Tea Plantations
[Objective]In the distribution area of Pleioblastus amarus,it's commonly seen that P.amarus plants expand in the Camellia sinensis garden.Investigating the response characteristics of C.sinensis leaf morphological traits and their allometric growth patterns to the heterogeneous environment after the expansion of P.amarus reveals valuable insights,which can provide a reference for controlling bamboo expansion within the tea plantation ecosystem and for sustainable management for tea plantation.[Method]C.sinensis leaf morphological traits were measured across three experimental sites:the mixed forest interface area(MA),the mixed forest center area(TB),and the pure tea plantation area(TF).Standard principal axis regression analysis was used to analyze variations in leaf morphological factors and their allometric growth patterns in response to bamboo expansion of P.amarus.[Result](1)Along the expansion from P.amarus to tea plantations,C.sinensis leaf traits,including leaf length(LL),leaf width(LW),leaf area(LA),specific leaf area(SLA),asymmetric fluctuation values of leaf width(AF(LW)),and asymmetric fluctuation values of leaf area(AF(LA)),gradually decreased,and peaked in the MA site,while leaf thickness(LT)increased steadily from P.amarus to tea plantations,reaching its maximum in the TF site.(2)In the TB site,LL—LW and SLA—LA demonstrated allometric growth patterns,with the smallest intercept,while no substantial changes were observed in the relative growth relationship between LL—LW and SLA—LA in the MA and TF sites.LA—LL and LA—LW shared a common slope among the three sites,significantly less than 1.00,an allometric growth pattern was observed.The intercepts exhibited an initial increase followed by a decrease along the expansion direction from P.amarus to tea plantations,with notable variations among the sites.[Conclusion]The expansion of P.amarus induced changes in the primary leaf morphological traits and their allometric growth patterns in C.sinensis.The expansion from P.amarus to tea plantations led to changes that C.sinensis leaves were becoming smaller and thicker,notably in the interfacial area of the mixed forests,but the indexes of LL,LW and LA were more responsive to bamboo expansion in the mixed forest center area.
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