Dynamic Effects of Root Pruning on Growth and Root Morphology in P.elliottii×P.caribaea Cuttings

doi:10.13466/j.cnki.lyzygl.2019.03.020

Abstract

Abstract:

The container grown cuttings of P.elliottii×P.caribaea were cultured with air root pruning(RP) or without(control).The height of the raised bed were 30 cm,50 cm and 70 cm for the RP cuttings,respectively.The parameters including height,ground diameter,shoot biomass,root biomass,root length,root surface area,root diameter and fine root ratio,were monitored monthly within half a year.Although the root morphology was affected,no significant effects were found on cutting growth and biomass by root pruning.The root length was significantly increased in the RP cuttings at 70 cm-height bed 4 months after treatment.However,the root system of the RP cuttings changed from elongation to diameter growth.The fine root ratio decreased,and the root diameter increased compared to the control.The correlation between the growth and root diameter increased gradually,whereas the correlation between the growth and root length tended to decrease.It was implied that the changes in root morphology in RP cuttings would benefit the cutting growth.It is recommendes to use 70 cm-height bed for air root pruning for P.elliottii×P.caribaea cuttings.

Key words: P.elliottii×P.caribaea, air root pruning, ground diameter, container grown cuttings, adventitious roots

CLC Number:

S723.1

LIN Changming, PENG Guanming, HUANG Zengyue, HUANG Ting, SITU Wendou, LI Zhen, GUO Wenbing, ZHAO Fencheng. Dynamic Effects of Root Pruning on Growth and Root Morphology in P.elliottii×P.caribaea Cuttings[J]. FOREST RESOURCES WANAGEMENT, 2019, (3): 118-123.

Figures/Tables 6

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指标	1M	2M	3M	4M	5M	6M
地径(D)	0.944	0.556	0.764	0.398	0.177	0.303
株高(H)	0.445	0.870	0.441	0.616	0.488	0.794
地上部鲜重(SFW)	0.354	0.381	0.586	0.342	0.280	0.987
根鲜重(RFW)	0.874	0.949	0.203	0.137	0.913	0.444
地上部干重(SDW)	0.289	0.432	0.735	0.427	0.226	0.944
根干重(RDW)	0.717	0.432	0.241	0.075	0.200	0.793

指标	1M	2M	3M	4M	5M	6M
根冠比(R/S)	0.999	0.365	0.052	0.061	0.636	0.481
总根长(RL)	0.826	0.996	0.917	0.026	0.212	0.140
根表面积(RSA)	0.819	0.920	0.637	0.110	0.793	0.106
根平均直径(RD)	0.856	0.323	0.772	0.729	0.029	0.152
细根长(FRL)	0.803	0.979	0.979	0.008	0.095	0.235
细根比例(FRR)	0.879	0.124	0.255	0.370	0.046	0.197

	地径	株高	根鲜重	地上部鲜重	地上部干重	根干重	根冠比	总根长	根表面积	根直径	细根长
株高	0.525^*
根鲜重	0.571^*	0.456^*
地上部鲜重	0.696^*	0.636^*	0.587^*
地上部干重	0.703^*	0.629^*	0.560^*	0.956^*
根干重	0.578^*	0.432^*	0.920^*	0.599^*	0.598^*
根冠比	0.208^*	0.049	0.673^*	0.031	-0.010	0.735^*
总根长	0.382^*	0.269^*	0.718^*	0.351^*	0.334^*	0.588^*	0.499^*
根表面积	0.508^*	0.373^*	0.899^*	0.475^*	0.447^*	0.797^*	0.639^*	0.926^*
根直径	0.454^*	0.339^*	0.621^*	0.403^*	0.377^*	0.660^*	0.476^*	0.038	0.388^*
细根长	0.289^*	0.208^*	0.595^*	0.269^*	0.258^*	0.460^*	0.407^*	0.977^*	0.834^*	-0.140^*
细根比例	-0.354^*	-0.203^*	-0.362^*	-0.267^*	-0.253^*	-0.415^*	-0.305^*	0.112^*	-0.190^*	-0.858^*	0.300^*

批次	地径与根系形态				株高与根系形态
批次	根表面积	根直径	总根长	细根比例	根表面积	根直径	总根长	细根比例
1M	0.519^*	0.135	0.475^*	0.007	0.335^*	0.116	0.304^*	0.042
2M	0.364^*	0.247^*	0.288^*	-0.202^*	0.202^*	0.264^*	0.137	-0.187^*
3M	0.492^*	0.300^*	0.384^*	-0.065	0.208^*	0.325^*	0.090	-0.171
4M	0.538^*	0.313^*	0.430^*	-0.189^*	0.391^*	0.256^*	0.304^*	-0.116
5M	0.348^*	0.419^*	0.195^*	-0.308^*	0.212^*	0.276^*	0.109	-0.228^*
6M	0.448^*	0.444^*	0.261^*	-0.317^*	0.372^*	0.423^*	0.173	-0.308^*