Change Characteristics of Growth Period of Spring Rape in Central and Southern Tibet During 2010-2019

doi:10.11924/j.issn.1000-6850.casb2020-0527

Abstract

Abstract:

To study the response characteristics of the growth period of highland spring rape to climate change under global warming, we used linear regression method to analyze the change of spring rape growth period in central and southern Tibet based on the rape development stage data in the Zedang agro-meteorological observation station of 2010-2019 and the corresponding daily meteorological data of 1981-2019. The results showed that: (1) both sunshine duration and mean wind speed exhibited a decreasing trend during 1981-2019, with the rate of -22.37 h/10 a and -0.32 (m/s)/10 a, respectively, the other meteorological factors presented an increasing trend simultaneously, with an obvious characteristic of warm and wet climate; however, both heat (T_m, T_max, T_min and ∑T₀) and sunshine hours (S) during vegetative growth period (VGP), reproductive growth period (RGP) and whole growth period (WGP) exhibited a deceasing trend from 1981 to 2019, and water resources (precipitation and relative humidity) and mean wind speed increased; (2) the main growth stages, including squaring, peduncle, flowering and green ripening stage, did not have significant change during 2010-2019, but the sowing and emergence stage were delayed, while the five-leave and mature stage exhibited earlier trend; all growth periods of VGP, RGP and WGP were shortened, which was particularly significant for the WGP with a rate of -2.23 days per year; (3) most of the spring rape growth periods had a significantly positive correlation with S &∑T₀, but no significant correlation could be identified between the spring rape growth periods and the other meteorological factors, the WGP days had a significantly positive correlation with S and ∑T₀, but negative correlation with RH. With the increasing RH and decreasing S & ∑T₀, the WGP days of spring rape exhibits a decreasing trend during 2010-2019.

Key words: spring rape, growth period, meteorological elements, change characteristics, impact factor, central and southern Tibet

CLC Number:

S162

Du Jun, Gao Jiajia, Li Aili, Tsewang Thondup, Tse Wang. Change Characteristics of Growth Period of Spring Rape in Central and Southern Tibet During 2010-2019[J]. Chinese Agricultural Science Bulletin, 2021, 37(20): 77-84.

Figures/Tables 7

References 31

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气象要素	SO-EM	EM-FI	FI-SQ	SQ-PE	PE-FL	FL-GR	GR-MA	VGP	RGP	WGP
T_m/(℃/a)	0.03	-0.08	-0.23	-0.25^**	-0.42^**	-0.10	-0.20^**	-0.20	-0.10	-0.11
T_max/(℃/a)	0.07	-0.01	-0.14	-0.35^**	-0.43^**	-0.10	-0.20	-0.18	-0.07	-0.07
T_min/(℃/a)	-0.10	-0.10	-0.35	-0.10	-0.33	-0.22^*	-0.23^**	-0.21	-0.20^**	-0.16
RH/(%/a)	0.26	1.25	1.05	1.58	2.29^**	0.82	1.10	1.64^*	0.65	1.16^*
Ws/[(m/s)/a]	-0.03	0.04	0.02	0.02	0.01	0.03	0.04	0.01	0.03	0.02
Pr/(mm/a)	0.92	-0.38	1.65	1.32^*	2.04	5.63	-1.14	2.59	4.49	8.26
S/(h/a)	-2.97	-22.74^**	4.85	1.95	-5.57^**	3.16	-9.64	-13.91	-6.48	-34.59^**
∑T₀/[(℃·d)/a]	-2.17	-28.44^**	5.65	6.38	-8.36	12.25	-23.81^*	-21.98	-11.56	-47.19^*
DTR/(℃/a)	0.17	0.09	0.20^**	-0.24	-0.10	0.12	0.04	0.03	0.13	0.09

气象要素	SO-EM	EM-FI	FI-SQ	SQ-PE	PE-FL	FL-GR	GR-MA	VGP	RGP	WGP
T_m/(℃/a)	0.03	-0.08	-0.23	-0.25^**	-0.42^**	-0.10	-0.20^**	-0.20	-0.10	-0.11
T_max/(℃/a)	0.07	-0.01	-0.14	-0.35^**	-0.43^**	-0.10	-0.20	-0.18	-0.07	-0.07
T_min/(℃/a)	-0.10	-0.10	-0.35	-0.10	-0.33	-0.22^*	-0.23^**	-0.21	-0.20^**	-0.16
RH/(%/a)	0.26	1.25	1.05	1.58	2.29^**	0.82	1.10	1.64^*	0.65	1.16^*
Ws/[(m/s)/a]	-0.03	0.04	0.02	0.02	0.01	0.03	0.04	0.01	0.03	0.02
Pr/(mm/a)	0.92	-0.38	1.65	1.32^*	2.04	5.63	-1.14	2.59	4.49	8.26
S/(h/a)	-2.97	-22.74^**	4.85	1.95	-5.57^**	3.16	-9.64	-13.91	-6.48	-34.59^**
∑T₀/[(℃·d)/a]	-2.17	-28.44^**	5.65	6.38	-8.36	12.25	-23.81^*	-21.98	-11.56	-47.19^*
DTR/(℃/a)	0.17	0.09	0.20^**	-0.24	-0.10	0.12	0.04	0.03	0.13	0.09

生育期	SO	EM	FI	SQ	PE	FL	GR	MA
LTV/(d/a)	1.50	1.19	-1.04	-0.22	-0.07	-0.35	0.37	-0.84
R值	0.461	0.506	-0.463	-0.087	-0.031	-0.130	0.196	-0.318

生育期	SO	EM	FI	SQ	PE	FL	GR	MA
LTV/(d/a)	1.50	1.19	-1.04	-0.22	-0.07	-0.35	0.37	-0.84
R值	0.461	0.506	-0.463	-0.087	-0.031	-0.130	0.196	-0.318

生育期天数	SO-EM	EM-FI	FI-SQ	SQ-PE	PE-FL	FL-GR	GR-MA	VGP	RGP	WGP
平均值/d	8.8	21.8	18.9	7.7	8.8	26.5	21.2	48.4	47.7	113.7
最长值/d	22	44	29	13	12	38	37	65	64	139
最短值/d	5	13	12	5	4	17	14	41	38	102
趋势值/(d/a)	-0.32	-2.23^**	0.82	0.15	-0.28	0.72	-1.21	-1.26	-0.49	-2.35^*