早播及耕作措施对黄土高原半干旱区春小麦土壤氮磷元素的影响

doi:10.13866/j.azr.2021.05.18

Abstract

Abstract:

To study the effects of early sowing and tillage measures on soil nitrogen and phosphorus in a farmland ecosystem, 0-40 cm of soil supporting spring wheat (Triticum aestivum) in the semi-arid region of the Loess Plateau was collected and analyzed. Under early sowing and normal sowing conditions, the different tillage measures were as follows: traditional tillage (T), traditional tillage + straw returning (TS), no tillage (NT), and no tillage + straw mulching (NTS). Results were as follows. (1) Under different treatments, the contents of N (TN, $NO_3^--N$, and $NH_4^+-N$) and P (TP) in spring wheat-related soil had the characteristics of surface aggregation. The average value of soil N:P (1.713) was lower than the national average value (5.2) and the coefficient of variation was 26.99%-77.28%, which belonged to the medium variation level. (2) In the 0-40 cm soil layer, the TN,$NH_4^+-N$, and N:P levels of early sowing spring wheat were significantly lower than the levels found with normal sowing (i.e., by 23.1%-32.5%), which was not conducive to the accumulation of TN and $NH_4^+-N$, whereas $NO_3^--N$ and $NO_3^--N$:N levels were significantly higher in early sowing spring wheat than the levels achieved with normal sowing (i.e., by 30.5% and 41.5%, respectively), which was conducive to the retention of $NO_3^--N$ in the soil. (3) The contents of TN and TP under straw mulching conditions (NTS and TS) were higher than those under NT and T, but the contents of available nitrogen ($NO_3^--N$ and $NH_4^+-N$) showed the opposite trend. (4) Under different treatments, the contents of TP in the soil tended to be stable during the growth period, whereas the contents of N changed significantly at the tillering and flowering stages. Therefore, selecting suitable sowing times and tillage management measures will help to improve the accumulation and transformation efficiency of N and P elements in crop soil and will accelerate the restoration process of farmland ecosystems in the semi-arid area of the Loess Plateau.

Key words: semiarid region of Loess Plateau, early sowing, tillage measures, spring wheat, soil nitrogen and phosphorus

LIU Shuainan,LI Guang,SONG Liangcui,YUAN Jianyu,XIE Mingjun,WEI Xingxing. Effects of early sowing and tillage measures on nitrogen and phosphorus in the soil supporting spring wheat in the semi-arid area of the Loess Plateau[J].Arid Zone Research, 2021, 38(5): 1367-1375.

Figures/Tables 7

Tab. 1

Fig. 1

Tab. 2

Fig. 2

Fig. 3

Tab. 3

Characteristics of $NO_3^--N$ and $NO_4^+-N$ in 0-40 cm soil under different treatments of spring wheat"

处理	$NO_3^--N$			$N O 4 +$ -N			$NO_3^--N$∶N			$NH_4^+-N$∶N
处理	标准差	均值/（mg·kg^-1）	CV/%	标准差	均值/（mg·kg^-1）	CV/%	标准差	均值	CV/%	标准差	均值	CV/%
T	1.671	2.811AB	59.45	1.049	2.446A	42.89	0.010	0.018BC	56.74	0.008	0.016A	49.56
TS	0.980	2.242BC	43.70	0.861	2.165AB	39.77	0.006	0.012D	52.83	0.004	0.011BC	39.37
NT	1.548	2.341BC	66.14	0.979	2.276AB	43.02	0.008	0.013CD	59.70	0.004	0.012B	33.06
NTS	0.806	1.822C	44.26	0.915	2.247AB	40.73	0.004	0.009D	48.88	0.003	0.010BC	29.52
ET	2.009	3.453A	58.18	1.169	1.759BC	66.48	0.014	0.026A	53.59	0.008	0.013AB	63.56
ETS	1.542	3.283A	46.98	1.040	1.495C	69.54	0.010	0.021AB	46.10	0.006	0.010BC	65.88
ENT	2.647	3.425A	77.28	1.121	1.613C	69.48	0.016	0.022AB	71.94	0.008	0.011BC	73.15
ENTS	1.659	3.047AB	54.44	0.947	1.311C	72.26	0.011	0.019BC	58.17	0.006	0.008C	72.41

Tab. 3

Tab. 4

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播期	处理	编码	操作方式
正常播	传统耕作	T	3月18日播种,作物收货后至冬前三耕二耱
	传统耕作+秸秆还田	TS	3月18日播种,耕耱程序同T,收获脱粒后作物秸秆铡碎均匀覆盖原小区
	免耕	NT	3月18日播种,全年不进行耕作措施,不覆盖材料
	免耕+秸秆覆盖	NTS	3月18日播种,耕作同TS,秸秆覆盖同TS
早播	早播传统耕作	ET	3月3日播种,作物收货后至冬前三耕二耱
	早播传统耕作+秸秆还田	ETS	3月3日播种,耕耱程序同T,收获脱粒后作物秸秆铡碎均匀覆盖原小区
	早播免耕	ENT	3月3日播种,全年不进行耕作措施,不覆盖材料
	早播免耕+秸秆覆盖	ENTS	3月3日播种,耕作同TS,秸秆覆盖同TS

处理	TN			TP			N∶P
处理	标准差	均值/（g·kg^-1）	CV/%	标准差	均值/（g·kg^-1）	CV/%	标准差	均值	CV/%
T	0.076	0.173BCD	44.06	0.046	0.103B	44.40	1.262	1.980A	63.73
TS	0.082	0.208AB	39.55	0.042	0.112AB	37.27	1.030	2.075A	49.62
NT	0.070	0.193ABC	36.13	0.047	0.106AB	44.14	1.222	2.009A	60.85
NTS	0.076	0.222A	34.03	0.067	0.138A	48.96	1.390	1.976A	70.35
ET	0.044	0.131E	33.71	0.067	0.115AB	58.39	0.651	1.333B	48.86
ETS	0.056	0.159CDE	34.98	0.039	0.117AB	33.43	0.427	1.448B	29.51
ENT	0.053	0.152DE	35.21	0.042	0.119AB	35.31	0.351	1.302B	26.99
ENTS	0.057	0.172BCD	33.25	0.043	0.115AB	37.13	0.476	1.583AB	30.09

	T						TS
	$NO_3^--N$		$NH_4^+-N$		TP		$NO_3^--N$		$NH_4^+-N$		TP
	早播	正常播	早播	正常播	早播	正常播	早播	正常播	早播	正常播	早播	正常播
TN_SD	0.262	0.289	0.265	0.516^**	0.438^**	0.129	0.219	0.273	0.368^*	0.532^**	0.622^**	0.309^*
$NO_3^--N$_SD	1.000	1.000	0.400^**	0.490^**	-0.056	-0.081	1.000	1.000	0.337^*	0.337^*	0.082	-0.065
$NH_4^+-N$_SD			1.000	1.000	0.273	0.287			1.000	1.000	0.130	0.213
	NT						NTS
	$NO_3^--N$		$NH_4^+-N$		TP		$NO_3^--N$		$NH_4^+-N$		TP
	早播	正常播	早播	正常播	早播	正常播	早播	正常播	早播	正常播	早播	正常播
TN_SD	0.390^*	0.237	0.361^*	0.638^**	0.768^**	0.491^**	0.270	0.279	0.274	0.680^**	0.675^**	0.515^**
$NO_3^--N$_SD	1.000	1.000	0.325^*	0.438^**	0.044	-0.180	1.000	1.000	0.041	0.449^**	0.251	0.491^**
$NH_4^+-N$_SD			1.000	1.000	0.293	0.383^**			1.000	1.000	0.070	0.641^**

Effects of early sowing and tillage measures on nitrogen and phosphorus in the soil supporting spring wheat in the semi-arid area of the Loess Plateau

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