Camellia oleifera Forest Land: NPK Content and Distribution Characteristics in Soil Profile Under Different Slopes

doi:10.11924/j.issn.1000-6850.casb20200100067

Abstract

Abstract:

To clarify the fertilizer supply capacity and distribution characteristics of N, P and K in soil of Camellia oleifera forest land, soil samples from different slopes (0°, 18°, 43°) and profile depths (0-60 cm) were collected to analyze the NPK nutrient contents and profile distribution characteristics under different site conditions. The results showed that the content of total NPK in the three slopes was 0.60-1.13, 0.62-0.65 and 27.53-32.27 mg/kg, respectively, and the content of available NPK was 89.81-145.00, 3.05-8.52 and 104.06-196.30 mg/kg, respectively. Multiple comparative analysis showed that there were significant differences in the total and available NPK in Camellia oleifera forest land at different slopes (P<0.05). The distribution characteristics of total NPK and available NPK in soil were similar, except total K, with the soil profile deepening and soil depth increasing, the soil fertility gradually decreased, and the distribution was surface accumulation. Analysis of soil fertility showed that the higher the slope, the lower the NPK nutrients. Correlation analysis showed that the total NPK were significantly correlated with available NPK. According to the comprehensive analysis, the slope of 0°-18° is suitable for planting Camellia oleiensis, but the slope of 43° and above is not suitable because of low soil fertility. The results could have certain application value in breeding and cultivation of Camellia oleifera in mountainous areas of Guizhou.

Key words: soil, slope gradient, Camellia oleifera forest, soil profile, nutrient distribution, NPK

CLC Number:

S156.2

Huang Anxiang, Zhou Xianyong, Yang Shoulu, Ji Ning, Zhu Yayan, Xu Jie, Zhang Yanxiong. Camellia oleifera Forest Land: NPK Content and Distribution Characteristics in Soil Profile Under Different Slopes[J]. Chinese Agricultural Science Bulletin, 2020, 36(34): 25-31.

Figures/Tables 6

References 25

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坡度/°	土壤质地	地貌	海拔/m	采样点数	剖面采样点/cm
43	沙质粘土	坡改梯	518	6	0~10、10~20、20~30、30~40、40~50、50~60
18	粘壤土	坡改梯	506	6	0~10、10~20、20~30、30~40、40~50、50~60
0	粘土	平地	482	6	0~10、10~20、20~30、30~40、40~50、50~60

坡度/°	土壤质地	地貌	海拔/m	采样点数	剖面采样点/cm
43	沙质粘土	坡改梯	518	6	0~10、10~20、20~30、30~40、40~50、50~60
18	粘壤土	坡改梯	506	6	0~10、10~20、20~30、30~40、40~50、50~60
0	粘土	平地	482	6	0~10、10~20、20~30、30~40、40~50、50~60

坡度/°	pH	全磷/(g/kg)	有效磷/(mg/kg)	全氮/(g/kg)	水解氮/(mg/kg)	全钾/(g/kg)	速效钾/(mg/kg)
0	6.42A	0.64±0.13a	8.52±2.24A	1.13±17A	145.78±22.23a	27.53±3.25a	196.30±20.16A
18	5.73B	0.62±0.15a	5.82±1.09B	0.80±10B	116.44±36.95b	29.86±2.39a	130.12±18.92aB
43	5.45C	0.65±0.10a	3.05±1.52C	0.60±18aB	89.81±16.82bA	32.27±2.72b	104.06±20.27bC

坡度/°	pH	全磷/(g/kg)	有效磷/(mg/kg)	全氮/(g/kg)	水解氮/(mg/kg)	全钾/(g/kg)	速效钾/(mg/kg)
0	6.42A	0.64±0.13a	8.52±2.24A	1.13±17A	145.78±22.23a	27.53±3.25a	196.30±20.16A
18	5.73B	0.62±0.15a	5.82±1.09B	0.80±10B	116.44±36.95b	29.86±2.39a	130.12±18.92aB
43	5.45C	0.65±0.10a	3.05±1.52C	0.60±18aB	89.81±16.82bA	32.27±2.72b	104.06±20.27bC

项目		pH	全氮	水解氮	全磷	有效磷	全钾	速效钾
pH	相关性R	1	0.185	0.086	0.163	0.342^**	0.513^**	0.284^**
pH	显著性P		0.092	0.435	0.140	0.001	0.000	0.009
全氮	相关性R		1	0.310^**	0.171	0.459^**	0.026	0.422^**
全氮	显著性P			0.004	0.120	0.000	0.815	0.000
水解氮	相关性R			1	0.267^*	0.222^*	-0.117	0.367^**
水解氮	显著性P				0.014	0.043	0.289	0.001
全磷	相关性R				1	0.289^**	0.327^**	0.498^**
全磷	显著性P					0.008	0.002	0.000
有效磷	相关性R					1	0.242^*	0.477^**
有效磷	显著性P						0.027	0.000
全钾	相关性R						1	0.435^**
全钾	显著性P							0.000
速效钾	相关性R							1
速效钾	显著性P