Effect of Tending Cutting on Phosphorus Content in Mixed Forest of Vernicia montana and Phoebe bournei in Fujian Province

doi:10.13466/j.cnki.lczyyj.2024.02.008

Abstract

Abstract:

The disturbance mechanism of phosphorus dynamic structure by tending cutting in the mixed forest of Vernicia montana and Phoebe bournei was clarified,providing a basis for the scientific management of soil phosphorus in this forest.Total phosphorus and available phosphorus content in soil and total phosphorus in branches,leaves,stems and roots of five year old Vernicia montana and Phoebe bournei from Fanqiao State-owned Forest Farm,Nanping,were determined.The impact of tending cutting on phosphorus content in rhizosphere soil and vegetative organs was studied.The results show that:1)Rhizosphere phosphorus enrichment was evident in both Vernicia montana and Phoebe bournei.Total phosphorus and available phosphorus levels in the rhizosphere soil were significantly higher than in non-rhizosphere soil before and after tending cutting(P<0.05).Tending cutting increased total phosphorus and available phosphorus in the rhizosphere soil(P<0.05).At a depth of 0-15 cm,rhizosphere soil phosphorus levels increased with depth for both species.2)Vernicia montana had higher total phosphorus and available phosphorus in rhizosphere soil at different soil depths compared to Phoebe bournei before and after tending cutting.After tending cutting,both total phosphorus content difference and available phosphorus content difference of rhizosphere soil increased at different soil depths of Vernicia montana and Phoebe bournei.The content of total phosphorus in branches,leaves,stems and roots of Vernicia montana and Phoebe bournei were increased by tending cutting.The content of total phosphorus in branches,leaves,stems and roots of Vernicia montana was higher than that of Phoebe bournei before and after tending cutting.3)Correlation analysis showed a significant positive correlation between available phosphorus in rhizosphere soil and total phosphorus in roots and leaves of Vernicia montana and Phoebe bournei(P<0.05),as wll as a significant positive correlation between total phosphorus in roots and total phosphorus in leaves(P<0.05).Tending cutting increased phosphorus content in vegetative organs and rhizosphere soil,with little effect on non-rhizosphere soil phosphorus.It promotes phosphorus activation and absorption in the rhizosphere soil of both.The effect of tending cutting on Vernicia montana was greater than on Phoebe bournei.The Vernicia montana root system is more developed than that of Phoebe bournei,granting it a stronger ability of soil phosphorus activation.

Key words: tending cutting, Vernicia montana, Phoebe bournei, rhizosphere, soil phosphorus

CLC Number:

S718.5

ZHENG Lingyu, LI Weihuang, XU Bingyan, WANG Yingzi, HONG Tao. Effect of Tending Cutting on Phosphorus Content in Mixed Forest of Vernicia montana and Phoebe bournei in Fujian Province[J]. Forest and Grassland Resources Research, 2024, (2): 59-67.

Figures/Tables 9

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样木	林分密度/ (株/hm²)	平均胸径/ cm	平均树高/ m	生长状况
千年桐	445	6.40	5.96	旺盛
闽楠	575	2.18	2.62	旺盛

测试项目	抚育间伐前	抚育间伐后
根际土全磷/(mg/g)	0.16±0.035Aa	0.25±0.044Ab
非根际土全磷/(mg/g)	0.026±0.015Ba	0.030±0.009 8Ba
全磷富集率/%	515.38	733.33
根际土有效磷/(mg/g)	0.015±0.006 7Aa	0.031±0.009 5Ab
非根际土有效磷/(mg/g)	0.000 90±0.000 87Ba	0.001 20±0.000 80Ba
有效磷富集率/%	1 566.67	2 483.33

测试项目	抚育间伐前	抚育间伐后
根际土全磷/(mg/g)	0.096±0.016Aa	0.14±0.021Ab
非根际土全磷/(mg/g)	0.026±0.015Ba	0.030±0.009 8Ba
全磷富集率/%	269.23	366.67
根际土有效磷/(mg/g)	0.012±0.002 2Aa	0.020±0.003 6Ab
非根际土有效磷/(mg/g)	0.000 90±0.000 87Ba	0.001 20±0.000 80Ba
有效磷富集率/%	1 233.33	1 566.67

测试项目	抚育间伐前	抚育间伐后	测试项目	抚育间伐前	抚育间伐后
千年桐枝/(mg/g)	0.94±0.11Aa	1.20±0.21Ab	闽楠枝/(mg/g)	0.74±0.10Ba	0.84±0.14Ba
千年桐叶/(mg/g)	1.39±0.33Aa	1.78±0.52Aa	闽楠叶/(mg/g)	1.37±0.31Aa	1.61±0.29Aa
千年桐干/(mg/g)	0.50±0.23Aa	0.71±0.19Aa	闽楠干/(mg/g)	0.40±0.17Aa	0.59±0.16Aa
千年桐根/(mg/g)	1.89±0.22Aa	2.56±0.47Ab	闽楠根/(mg/g)	1.64±0.16Aa	2.06±0.25Bb