Response of Bio-available Phosphorus and Water-soluble Phosphorus to Phosphorus Accumulation in Soil

doi:10.11923/j.issn.2095-4050.cjas18100017

Abstract

Abstract:

Taking cultivated land in four kinds of landforms in Zhejiang, including river valley plain, river network plain, coastal plain and hilly area, as the examples, the changing characteristics of bio-available phosphorus and water-soluble phosphorus with total phosphorus accumulation in soil were studied. The results showed that soil bio-available phosphorus and water-soluble phosphorus increased obviously with the increase of total phosphorus accumulation, there was a changing point in the increase. When soil total phosphorus reached 0.80-0.95 g/kg, the bio-available phosphorus increased significantly with the increase of soil total phosphorus accumulation. When the bio-available phosphorus was at 42-62 and 165-265 mg/kg, respectively, the soil water-soluble phosphorus level had two obvious increasing processes. Overall, the critical value of the accumulated total soil phosphorus was relatively low when soil bio-available and water-soluble phosphorus changed significantly in the valley plain. Since the proportion of readily available phosphorus in the total soil phosphorus increases with increasing phosphorus accumulation in soil, it is concluded that controlling the excessive accumulation of total phosphorus in soil could effectively reduce the loss of soil phosphorus.

Key words: Soil Phosphorus Accumulation, Available Phosphorus, Water-soluble Phosphorus, Changing point

CLC Number:

S158

Tong Wenbin, Qiu Zhiteng, Zhang Mingkui. Response of Bio-available Phosphorus and Water-soluble Phosphorus to Phosphorus Accumulation in Soil[J]. Journal of Agriculture, 2020, 10(1): 37-42.

Figures/Tables 6

References 27

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土区	磷水平	回归方程	r	n
滨海平原	低于转折点：TP<0.85 g/kg; Olsen P<30.50 mg/kg	Y = 76.36X - 34.84	0.963	50
滨海平原	高于转折点：TP>0.85 g/kg; Olsen P>30.50 mg/kg	Y= 349.23X - 265.16	0.993	43
水网平原	低于转折点：TP<0.95 g/kg; Olsen P<34.80 mg/kg	Y= 67.13X - 29.50	0.955	58
水网平原	高于转折点：TP>0.95 g/kg; Olsen P>34.80 mg/kg	Y= 211.81X - 166.45	0.976	47
河谷平原	低于转折点：TP<0.80 g/kg; Olsen P<20.50 mg/kg	Y= 41.15X - 12.74	0.954	48
河谷平原	高于转折点：TP>0.80 g/kg; Olsen P>20.50 mg/kg	Y= 306.80X - 219.20	0.989	43
山地丘陵	低于转折点：TP<0.91 g/kg; Olsen P<25.60 mg/kg	Y= 46.01X - 17.50	0.951	58
山地丘陵	高于转折点：TP>0.91 g/kg; Olsen P>25.60 mg/kg	Y= 251.15X - 202.93	0.987	25

土区	磷水平	回归方程	r	n
滨海平原	低于转折点：TP<0.85 g/kg; Olsen P<30.50 mg/kg	Y = 76.36X - 34.84	0.963	50
滨海平原	高于转折点：TP>0.85 g/kg; Olsen P>30.50 mg/kg	Y= 349.23X - 265.16	0.993	43
水网平原	低于转折点：TP<0.95 g/kg; Olsen P<34.80 mg/kg	Y= 67.13X - 29.50	0.955	58
水网平原	高于转折点：TP>0.95 g/kg; Olsen P>34.80 mg/kg	Y= 211.81X - 166.45	0.976	47
河谷平原	低于转折点：TP<0.80 g/kg; Olsen P<20.50 mg/kg	Y= 41.15X - 12.74	0.954	48
河谷平原	高于转折点：TP>0.80 g/kg; Olsen P>20.50 mg/kg	Y= 306.80X - 219.20	0.989	43
山地丘陵	低于转折点：TP<0.91 g/kg; Olsen P<25.60 mg/kg	Y= 46.01X - 17.50	0.951	58
山地丘陵	高于转折点：TP>0.91 g/kg; Olsen P>25.60 mg/kg	Y= 251.15X - 202.93	0.987	25

土区	有效P水平/(mg/kg)	回归方程	r	n
滨海平原	<53	Y = 0.0040X - 0.005	0.926	56
	53~250	Y = 0.013X - 0.57	0.958	28
	>250	Y = 0.027X - 1.73	0.871	9
水网平原	<57	Y = 0.0030X - 0.004	0.904	62
	57~235	Y = 0.013X - 0.38	0.932	34
	>235	Y = 0.052X - 10.14	0.915	9
河谷平原	<42	Y = 0.0060X - 0.011	0.876	52
	42~265	Y = 0.017X - 0.36	0.973	21
	>265	Y = 0.042X - 6.21	0.940	18
山地丘陵	<62	Y = 0.0040X - 0.004	0.974	62
	62~165	Y = 0.0080X - 0.076	0.835	14
	>165	Y = 0.016X-1.659	0.994	7

土区	有效P水平/(mg/kg)	回归方程	r	n
滨海平原	<53	Y = 0.0040X - 0.005	0.926	56
	53~250	Y = 0.013X - 0.57	0.958	28
	>250	Y = 0.027X - 1.73	0.871	9
水网平原	<57	Y = 0.0030X - 0.004	0.904	62
	57~235	Y = 0.013X - 0.38	0.932	34
	>235	Y = 0.052X - 10.14	0.915	9
河谷平原	<42	Y = 0.0060X - 0.011	0.876	52
	42~265	Y = 0.017X - 0.36	0.973	21
	>265	Y = 0.042X - 6.21	0.940	18
山地丘陵	<62	Y = 0.0040X - 0.004	0.974	62
	62~165	Y = 0.0080X - 0.076	0.835	14
	>165	Y = 0.016X-1.659	0.994	7

土区	回归方程	R²	n
滨海平原	Y= 2.00 - 6.55X+5.23X²	0.961	93
水网平原	Y= 1.58 - 4.16X+2.74X²	0.972	105
河谷平原	Y= 0.64 -3.51X+4.01X²	0.969	91
丘陵山地	Y=0.48 -1.70X+1.50X²	0.996	83