Effects of the litter leaching process by throughfall after clear cutting of primary Pinus koraiensis forest

doi:10.12302/j.issn.1000-2006.201907046

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (1): 159-167.doi: 10.12302/j.issn.1000-2006.201907046

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Effects of the litter leaching process by throughfall after clear cutting of primary Pinus koraiensis forest

LIU Nan(), FENG Fujuan^*(), ZHANG Xiuyue

College of Life Sciences, Northeast Forestry University, Harbin 150040, China

Received:2019-07-31 Accepted:2020-04-08 Online:2021-01-30 Published:2021-02-01
Contact: FENG Fujuan E-mail:2692704985@qq.com;ffj9018@sina.com

Abstract

Abstract:

【Objective】The effects of the throughfall leaching process on the litter nutrient release into soil nutrition and the buffer action of litter on throughfall-accompanied acid deposition were assessed in a primary Pinus koraiensis forest and in a secondary broad-leaved forest that had recovered for 60 years after clear-cutting. 【Method】 We selected a typical primary P. koraiensis forest and a 60-year-succession secondary broad-leaved forest after clear cutting of the primary forest in Lesser Khingan Mountains as the research materials. Two sampling sites were set and 30 throughfall collectors with a volume of 1 L were placed in the two sites with nonforest gaps and the uniform straight tree distribution. A litter leaching solution collector was set up near each throughfall collector. We collected in situ the solution of throughfall and litter leaching in the two forests at an interval of 45 days from April to November 2017. The concentrations of nutrient elements and dissolved organic matter (DOM), and pH values in the litter leaching solution of the two forest types were compared. 【Result】Compared to the primary P. koraiensis forest, the total amount of leaching nutrient elements in the secondary broad-leaved forest was significantly lower (P <0.05). The changing patterns of leached elements were inconsistent between the two forests. The release peak of nutrient elements of the two forest types both occurred mainly in June and July. The total amounts of DOM, dissolved organic carbon (DOC) and dissolved organic phosphorus (DOP) leached from the litters were significantly higher, but the total dissolved organic nitrogen (DON) was lower in the primary P. koraiensis forest than in the secondary broad-leaved forest (P <0.01). The changing patterns of the nutrient elements and DOM in the throughfall and litter leaching solutions were similar between the two forest types. The pH value of the throughfall ranged from 5.34 to 7.21, while the pH value of leachate in the litter ranged from 6.37 to 7.65. The results indicated that the litter layer effectively regulated the pH of the throughfall. The range of pH regulation by the litter layers was larger in the primary P. koraiensis forest than that in the secondary broad-leaved forest. 【Conclusion】The litter layers play regulatory roles in solution pH before the throughfall into forest soils. Compared to the primary P. koraiensis forest, the nutrient release efficiency and pH adjustment of the litter layers were lower in the secondary broad-leaved forest.

Key words: primary Pinus koraiensis forest, restoration succession, litter, leaching, soil nutrient element, dissolved organic matter, acid buffering

CLC Number:

S718

LIU Nan, FENG Fujuan, ZHANG Xiuyue. Effects of the litter leaching process by throughfall after clear cutting of primary Pinus koraiensis forest[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2021, 45(1): 159-167.

Figures/Tables 9

Fig.1

Table 1

Table 2

Two-way ANOVA for the mass concentration of nutrient elements in the litter leaching solution to forest type (F) and leaching time (L)"

差异来源 difference source	自由度 df	全氮TN		全磷TP		全钾TK		全钙TCa
差异来源 difference source	自由度 df	F	P	F	P	F	P	F	P
林型F	1	837.23	<0.01	280.16	<0.01	13.50	<0.01	65.96	<0.01
淋溶时间L	4	345.52	<0.01	1 678.47	<0.01	8.15	<0.01	102.47	<0.01
林型×淋溶时间F×L	4	107.43	<0.01	214.72	<0.01	11.11	<0.01	16.01	<0.01
差异来源 difference source	自由度 df	全钠TNa		全镁TMg		铵态氮N $H 4 +$ -N		硝态氮N $O 3 -$ -N
差异来源 difference source	自由度 df	F	P	F	P	F	P	F	P
林型F	1	5.91	<0.01	23.64	<0.01	58.60	<0.01	350.03	<0.01
淋溶时间L	4	7.22	<0.01	36.13	<0.01	49.77	<0.01	70.62	<0.01
林型×淋溶时间F×L	4	6.11	<0.01	36.17	<0.01	67.77	<0.01	55.79	<0.01

Table 2

Fig.2

Fig.3

Fig.4

Table 3

Fig.5

Fig.6

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林型 forest type	含量/(g·kg^-1) mass concentration								质量比mass ratio
林型 forest type	全碳TC	全氮 TN	全磷 TP	全钾 TK	全钙 TCa	全镁 TMg	木质素 lignin	纤维素 cellulose	碳/氮 C/N	木质素/N lignin/N
原始红松林 primary Pinus koraiensis forest	479.46± 3.56 a	12.03± 0.52 a	0.70± 0.003 a	1.48± 0.03 a	18.01± 0.49 a	0.91± 0.05 a	389.62± 7.35 a	336.63± 12.38 a	39.92± 1.55 a	32.47± 2.29 a
次生阔叶林 secondary broad- leaved forest	468.80± 9.42 b	14.35± 0.80 b	0.92± 0.36 b	2.37± 0.05b	16.36± 1.73 a	1.04± 0.01 b	286.36± 7.64 b	276.71± 11.67 b	32.81± 2.45 b	20.03± 1.73 b

Effects of the litter leaching process by throughfall after clear cutting of primary Pinus koraiensis forest

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差异来源 difference source	自由度 df	可溶性有机碳 DOC		可溶性有机氮 DON		可溶性有机磷 DOP
差异来源 difference source	自由度 df	F	P	F	P	F	P
林型F	1	2 410.08	<0.01	350.03	<0.01	4.36	<0.01
淋溶时间L	4	15 378.76	<0.01	70.62	<0.01	275.59	<0.01
F×L	4	226 775.00	<0.01	55.79	<0.01	139.17	<0.01