Photosynthetic and Carbon Sequestration Characteristics of Michelia shiluensis Chun et Y. F. Wu

doi:10.3969/j.issn.1000-2561.2019.02.007

Abstract

Abstract:

In this study, two-year-old Michelia shiluensis grafting seedlings were studied. In order to evaluate the adaptation and its ecological effect of M. shiluensis, a LI-6400 portable photosynthetic system was used to measure the photosynthetic characteristics and estimate their carbon sequestration. The results showed that the variations of net photosynthetic rate (P_n) in M. shiluensis did not present a single bimodal in four seasons of a year. The change curve of January, April and July was bimodal, but that in October is unimodal. In different months, P_n changed from the largest to the smallest in the following order: October, July, April and January. M. shiluensis grew fastest in October. There was a higher photosynthetic rate in autumn with lower atmospheric temperature and weaker light intensity. The light compensation point was low and light saturation point was high, indicating that M. shiluensis could be adapted to different lighting environments. The annual average daily net solid carbon content was 10.07 g/(m ²·d), with strong carbon sequestration ability. The results indicate that M. shiluensis can be adapted to both the strong and weak lighting. Under hot weather conditions in South China, it also has the adaptive self-regulation mechanism of “siesta”, and had strong carbon sink ability, with good landscape efficiency and excellent ecological benefits, and it is suitable for planting in southern China.

Key words: Michelia shiluensis Chun et Y. F. Wu, photosynthesis, carbon sequestration

CLC Number:

S796

ZHANG Peng,XU Yilin,XI Ruchun. Photosynthetic and Carbon Sequestration Characteristics of Michelia shiluensis Chun et Y. F. Wu[J]. Chinese Journal of Tropical Crops, 2019, 40(2): 254-260.

Figures/Tables 8

References 30

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指标Index	T_a	PAR	C_a	R_h	P_n	T_r	G_s	C_i	WUE
T_a
PAR	0.492^**
C_a	-0.675^**	-0.522^**
R_h	0.153	-0.167	-0.243
P_n	0.473^*	0.701^**	-0.219	-0.109
T_r	0.728^**	0.818^**	-0.688^**	0.110	0.721^**
G_s	0.539^**	0.673^**	-0.715^**	0.454^*	0.568^**	0.865^**
C_i	-0.547^**	-0.410^*	0.123	0.480^**	-0.701^**	-0.418^*	-0.049
WUE	-0.379^*	-0.233^*	0.716^**	-0.100	0.182	-0.389^*	-0.427^*	-0.222
L_s	0.312	0.229	0.209	-0.558^**	0.619^**	0.186	-0.189	-0.944^**	0.457^*

指标Index	T_a	PAR	C_a	R_h	P_n	T_r	G_s	C_i	WUE
T_a
PAR	0.492^**
C_a	-0.675^**	-0.522^**
R_h	0.153	-0.167	-0.243
P_n	0.473^*	0.701^**	-0.219	-0.109
T_r	0.728^**	0.818^**	-0.688^**	0.110	0.721^**
G_s	0.539^**	0.673^**	-0.715^**	0.454^*	0.568^**	0.865^**
C_i	-0.547^**	-0.410^*	0.123	0.480^**	-0.701^**	-0.418^*	-0.049
WUE	-0.379^*	-0.233^*	0.716^**	-0.100	0.182	-0.389^*	-0.427^*	-0.222
L_s	0.312	0.229	0.209	-0.558^**	0.619^**	0.186	-0.189	-0.944^**	0.457^*

指标Index	P_nmax	Chla	Chlb
P_nmax
Chla	0.845^*
Chlb	-0.004	-0.329
Chlt	0.857^*	0.999^**	-0.285

指标Index	P_nmax	Chla	Chlb
P_nmax
Chla	0.845^*
Chlb	-0.004	-0.329
Chlt	0.857^*	0.999^**	-0.285

指标 Index	4月 April	7月 July	10月 October	1月 January	全年平均 Annual average
净固碳量 Net carbon sequestration/(g·m^-2·d^-1)	9.10±1.49^BC	11.07±0.51^AB	13.25±0.41^A	6.87±0.84^C	10.07±0.81
释氧量 Oxygen release/(g·m^-2·d^-1)	6.61±1.08^BC	8.05±0.36^AB	9.63±0.30^A	5.00±0.61^C	7.32±0.59