Soil nitrification denitrification respiration and their influence factor analysis in different vegetation zones along elevationnal gradient in Mao’er Mountain of China

doi:10.3969/j.issn.1000-2006.201808031

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (1): 81-88.doi: 10.3969/j.issn.1000-2006.201808031

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Soil nitrification denitrification respiration and their influence factor analysis in different vegetation zones along elevationnal gradient in Mao’er Mountain of China

DENG Xiaojun¹(), TANG Jian¹, WANG Huili¹, SONG Xianchong¹, CAO Jizhao¹, QING Zuoyu¹, SONG Guangtao²^,^*()

1. Guangxi Zhuang Autonomous Region Forestry Research Institute, Key Laboratory of Central South Fast-Growing Timber Cultivation of Forestry Ministry of China, Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Nanning 530003, China
2. Hunan Environment-Biologic Polytechnic, Hengyang 421005, China

Received:2018-08-15 Revised:2019-10-22 Online:2020-02-08 Published:2020-02-02
Contact: SONG Guangtao E-mail:dengxiaojun2008@sina.com;823769006@qq.com

Abstract

Abstract:

【Objective】 To study the effects of soil respiration, nitrification, and denitrification and the influence of various environmental factors in vegetation zones at different altitudes in the Mao’er Mountain.【Method】 Different forest types at a National Nature Reserve in Mao’er Mmountain were the experimental sites. Soil respiration rate (SRR), gross nitrification rate (GNR) and denitrification rate (DR) in different vegetation zones at different altitudes were investigated based on the Barometric Process Separation system, and the response of SRR, GNR or DR to soil temperature and other environmental factors was studied.【Result】 Under normal temperature, the SRR was in the order of Chinese fir plantation (CFP) > evergreen and deciduous broad-leaved forest (EDBF) > bamboo plantation (BP) > mountaintop shrub (MS) > (Southern hemlock forest (SHF) > Beech natural forest (BNF), and the highest rate was 361.6 μg/(kg·h) at CPF. The GNR in the SHF was 275.3 μg/(kg·h), and the lowest GNR was 58.3 μg/(kg·h) in the BP. In addition, the DRs were in the order BP>CFP>EDBF>BNF>SHF>MS, and the highest was 172.2 μg/(kg·h) at BP. SRR, GNR and DR in the six vegetation zones increased with an increase of temperature when the temperature was between 5 ℃ and 20 ℃. Correlation analysis results revealed that altitude, soil temperature, water content, pH, organic matter concentration, total nitrogen, total potassium, available N, available P and available K were the key factors influencing SRR, GNR and DR. 【Conclusion】 Low altitude plantations had higher SRRs and DRs than high altitude natural forests. However, soil nitrification, denitrification and respiration were more sensitive to temperature changes in high altitude vegetation. In the wake of climate change and the ensuing warming, soils in high altitude vegetation zones could release higher amounts of greenhouse gases.

Key words: soil respiration rate, gross nitrification rate, denitrification rate, vertical vegetation zone, Mao’er Mountain

CLC Number:

S714

DENG Xiaojun, TANG Jian, WANG Huili, SONG Xianchong, CAO Jizhao, QING Zuoyu, SONG Guangtao. Soil nitrification denitrification respiration and their influence factor analysis in different vegetation zones along elevationnal gradient in Mao’er Mountain of China[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2020, 44(1): 81-88.

Figures/Tables 5

Table 1

Table 2

Fig.1

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Table 3

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植被带 vegetation zones	海拔/m elevation	土壤类型 soil type	坡度/ (°) slope	坡向/ (°) slope aspect	郁闭度 canopy density	土壤温度/℃ soil temperature	地理坐标 geographic coordinate	主要树种组成 dominant species in tree layer
杉木人工林(CFP) Chinese fir plantation	1 130	山地黄红壤	5	NE 61	0.85	11.48	110°29'13″E, 25°53'15″N	杉木(Cunninghamia lanceolata)、青窄槭(Acer davidii)、光皮梾(Swida wilsoniana)等
毛竹人工林(BP) bamboo plantation	1 144	山地黄红壤	2	NE 49	0.80	12.00	110°29'17″E, 25°54'21″N	毛竹(Phyllostachys heterocycla)、交让木(Daphniphyllum macropodum)、团叶杜鹃(Rhododendron orbiculare)等
常绿、落叶阔叶混交林(EDBF) evergreen and deciduous broad-leaved forest	1 222	山地黄壤	42	NE 50	0.80	10.52	110°29'27″E, 25°53'15″N	罗浮栲(Castanopsis faberi)、钩栗(Castanopsis tibetana)、白辛树(Pterostyrax psilophyllus)等
水青冈天然林(BNF) beech natural forest	1 385	山地黄壤	35	SE 135	0.75	9.58	110°27'54″E, 25°54'21″N	长柄水青冈(Fagus longipetiolata)、摆竹(Indosasa shibataeoides)、团叶杜鹃等
南方铁杉林(SHF) southern hemlock forest	2 042	泥炭土	2	0	0.70	7.46	110°26'01″E, 25°53'48″N	南方铁杉(Tsuga chinensis)、曼椆(Cyclobalanopsis oxyodon)、丁香杜鹃(Rhododendron farrerae)等
山顶灌丛(MS) mountaintop shrub	2 045	山地黄棕壤	12	NE 62	0.90	8.04	110°24'45″E, 25°51'58″N	豪猪刺(Berberis julianae)、三花冬青(Ilex triflora)、灯笼树(Enkianthus chinensis)等

植被带 vegetation zones	pH	有机质含量/ (g·kg^-1) organic matter content	全氮含量/ (g·kg^-1) total N content	全磷含量 (P₂O₅) / (g·kg^-1) total P content	全钾含量 (K₂O) / (g·kg^-1) total K content	速效氮含量/ (mg·kg^-1) available N content	速效磷含量/ (mg·kg^-1) available P content	速效钾含量/ (mg·kg^-1) available K content	质量含水量/% moisture content	碳氮比 C/N
CFP	4.44±0.19 c	109.21±15.91 ab	4.68±0.62 ab	2.38±0.25 b	32.48±0.95 c	366.50±40.18 a	2.93±0.64 a	66.37±2.29 a	55.22±7.86 ab	13.53±0.23 c
BP	4.94±0.10 d	103.27±17.69 ab	4.08±0.31 a	1.96±0.13 a	26.70±7.38 bc	366.28±149.31 a	1.23±1.03 a	41.80±9.00 a	43.15±3.11 a	14.64±1.66 c
EDBF	4.10±0.02 b	149.39±35.63 b	6.40±1.62 b	2.00±0.30 a	23.66±2.78 b	631.33±176.80 b	3.10±0.98 a	78.07±9.50 a	63.02±14.81 ab	13.57±0.38 c
BNF	3.92±0.16 b	73.65±9.03 a	5.23±0.49 ab	1.94±0.10 a	30.32±0.28 bc	365.07±85.87 a	1.20±0.17 a	114.07±18.03 ab	77.57±11.40 ab	8.16±0.56 a
SHF	3.40±0.06 a	707.61±51.83 d	21.11±0.81 d	1.77±0.08 a	8.62±3.39 a	1830.20±82.82 d	7.37±3.18 b	233.80±83.86 c	276.08±67.20 c	19.47±1.90 d
MS	3.51±0.10 a	244.81±45.17 c	12.94±1.25 c	1.76±0.15 a	25.82±0.44 bc	974.27±147.72 c	3.70±2.61 a	152.50±32.44 b	109.52±1.53 b	10.98±1.72 b

项目 item	pH	有机质 organic matter	全氮 total N	全磷 (P₂O₅) total P	全钾 (K₂O) total K	速效氮 available N	速效磷 available P	速效钾 available K	含水量 moisture content	碳氮比 C/N	海拔 elevation	土壤温度 soil temperature	土壤呼吸速率 SRR	总硝化速率 GNR	反硝化速率 DR
pH	1
有机质	-0.650^**	1
全量氮	-0.788^**	0.954^**	1
全量磷	0.483^*	-0.395	-0.472^*	1
全量钾	0.531*	-0.891^**	-0.824^**	0.467	1
速效氮	-0.731^**	0.973^**	0.983^**	-0.433	-0.871^**	1
速效磷	-0.544^*	0.779^**	0.795^**	-0.064	-0.662^**	0.820^**	1
速效钾	-0.771^**	0.799^**	0.877^**	-0.386	-0.683^**	0.853^**	0.822^**	1
含水量	-0.697^**	0.950^**	0.912^**	-0.479^*	-0.857^**	0.916^**	0.666^**	0.834^**	1
C/N	-0.082	0.755^**	0.567^*	-0.086	-0.740^**	0.663^**	0.580^*	0.323	0.629^**	1
海拔	-0.841^**	0.777^**	0.910^**	-0.601^**	-0.670^**	0.865^**	0.647^**	0.788^**	0.749^**	0.339	1
温度	0.955^**	-0.727^**	-0.866^**	0.601^**	0.607^**	-0.806^**	-0.580^*	-0.854^**	-0.771^**	-0.137	-0.912^**	1
SRR	-0.852^**	0.698^**	0.836^**	-0.359	-0.512^*	0.779^**	0.659^**	0.740^**	0.678^**	0.276	-0.890^**	0.555^*	1
GNR	-0.890^**	0.801^**	0.926^**	-0.591^**	-0.698^**	0.886^**	0.672^**	0.821^**	0.784^**	0.338	0.964^**	-0.760^**	0.923^**	1
DR	-0.821^**	0.897^**	0.977^**	-0.589^*	-0.774^**	0.940^**	0.708^**	0.857^**	0.875^**	0.468^*	-0.963^**	0.850^**	0.868^**	0.965^**	1

Soil nitrification denitrification respiration and their influence factor analysis in different vegetation zones along elevationnal gradient in Mao’er Mountain of China

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