Variations of morphology among first order roots in different branch orders and the effect of thinning on its’ morphology in Chinese fir plantation

doi:10.3969/j.issn.1000-2006.2014.04.013

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2014, Vol. 38 ›› Issue (04): 69-74.doi: 10.3969/j.issn.1000-2006.2014.04.013

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Variations of morphology among first order roots in different branch orders and the effect of thinning on its’ morphology in Chinese fir plantation

WANG Dong, LI Ruixia, CHEN Xinli, GUAN Qingwei^*

College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China

Online:2014-07-31 Published:2014-07-31

Abstract

Abstract: The number, diameter, length and sepecific root length(SRL)of first order roots in different branch orders among four thinning intensities(CK. 0, LIT. 30%, MIT. 50%, HIT. 70%)of Chinese fir(25years)plantation were studied in Nanjing Lishui Forest Farm of Jiangsu province. First-order root samples from plantations were separated into four categories: Ar(from 2nd-order), Br(from 3rd-order), Cr(from 4th-order)and Dr(from 5th-order). Results showed that: The first order roots in different branch orders showed significant differences in numbers and root length(p<0.05), whereas there were no significant differences observed in both root diameter and SRL. The numbers of first-order root in different root orders significantly increased with increasing root order(p<0.05):Ar(79%)>Br(13%)>Cr(6%)>Dr(2%). And Dr was significantly longer than the others in length(p<0.05). Compared with the control plots, only the diameter of Br and Dr and the length of Dr had a significant response to thinning practice.The mean diameter of Dr significantly increased in MIT plot, but the length of it significantly decreased in LIT plot. The mean diameter of Br both LIT and HIT markedly decreased. Correlation analysis showed, the non-target live fine root in 0-10 cm soil depth and soil total N in ≥10-20 cm depth had a significantly negative effect on the diameter of Br and Dr, whereas a significantly positive relationship was observed between soil total N at 0-10 cm depth and the root length of Dr.

CLC Number:

S718

WANG Dong, LI Ruixia, CHEN Xinli, GUAN Qingwei. Variations of morphology among first order roots in different branch orders and the effect of thinning on its’ morphology in Chinese fir plantation[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2014, 38(04): 69-74.

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Variations of morphology among first order roots in different branch orders and the effect of thinning on its’ morphology in Chinese fir plantation

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