CONTENTS AND ISOTOPIC COMPOSITION OF C AND N IN MOSS (HAPLOCLADIUM MICROPHYLLUM) TISSUES AND SOIL RHIZOSPHERE

doi:10.17521/cjpe.2007.0145

Abstract

Abstract:

Aims We investigated the new and senescent tissues of moss and the soil rhizosphere to determine 1) the elemental and isotopic composition characteristics during senescence and 2) the final contribution to soil.

Methods C and N contents and isotopic composition (δ¹³C and δ¹⁵N) of Haplocladium microphyllum and its soil rhizosphere were analyzed at Guiyang, China.

Important findings The C and N contents were higher in new growing tissues than in senescent tissues, and there were significant correlations between the two types of tissues, indicating physiological malfunction (e.g., loss of photosynthesis) and internal element redistribution during moss senescence. No significant difference was found between new and senescent tissues in isotopic composition, but their δ¹³C values or δ¹⁵N values were correlated, suggesting special isotopic regulation in the simple and nonvascular structure of mosses. In contrast, there was no C or N correlation between the moss tissues and soil. This was attributed to long-term nutrient retention and slow deposition to form soil, indicating the moss layer in this area has a small contribution to soil carbon and nitrogen.

Key words: stable isotope, moss, senescence, decomposition, rhizosphere

LIU Xue-Yan, XIAO Hua-Yun, LIU Cong-Qiang, LI You-Yi. CONTENTS AND ISOTOPIC COMPOSITION OF C AND N IN MOSS (HAPLOCLADIUM MICROPHYLLUM) TISSUES AND SOIL RHIZOSPHERE[J]. Chin J Plant Ecol, 2007, 31(6): 1168-1173.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2007.0145

https://www.plant-ecology.com/EN/Y2007/V31/I6/1168

Figures/Tables 4

References 24

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样品 Sample No.	碳含量 Carbon content (%)					氮含量 Nitrogen content (%)
样品 Sample No.	新生组织 New tissue	衰老组织 Senescent tissue		根际土壤 Rhizosphere soil		新生组织 New tissue	衰老组织 Senescent tissue	根际土壤 Soil rhizosphere
T1	41.4		39.2		5.8	2.25	1.79	0.36
T2	42.0		40.1		4.9	2.31	1.91	0.31
T3	40.5		38.8		6.6	2.2	1.74	0.46
T4	41.7		38.0		6.6	2.24	1.73	0.34
T5	42.3		41.6		6.0	2.35	2.04	0.36
T6	41.9		40.9		5.6	2.33	1.91	0.33
平均值 Average	41.6±0.6		39.8±1.4		5.9±0.6	2.28±0.06	1.85±0.12	0.36±0.05

样品 Sample No.	碳含量 Carbon content (%)					氮含量 Nitrogen content (%)
样品 Sample No.	新生组织 New tissue	衰老组织 Senescent tissue		根际土壤 Rhizosphere soil		新生组织 New tissue	衰老组织 Senescent tissue	根际土壤 Soil rhizosphere
T1	41.4		39.2		5.8	2.25	1.79	0.36
T2	42.0		40.1		4.9	2.31	1.91	0.31
T3	40.5		38.8		6.6	2.2	1.74	0.46
T4	41.7		38.0		6.6	2.24	1.73	0.34
T5	42.3		41.6		6.0	2.35	2.04	0.36
T6	41.9		40.9		5.6	2.33	1.91	0.33
平均值 Average	41.6±0.6		39.8±1.4		5.9±0.6	2.28±0.06	1.85±0.12	0.36±0.05

样品 Sample No.	δ¹³C值 δ¹³C value (‰)			δ¹⁵N 值δ¹⁵N value (‰)
样品 Sample No.	新生组织 New tissue	衰老组织 Senescent tissue	根际土壤 Soil rhizosphere	新生组织 New tissue	衰老组织 Senescent tissue	根际土壤 Soil rhizosphere
T1	-29.0	-29.2	-25.0	-7.2	-7.3	1.8
T2	-29.4	-29.4	-24.9	-7.6	-7.0	0.6
T3	-29.1	-29.3	-25.7	-7.4	-9.4	2.5
T4	-31.3	-30.9	-24.8	-5.5	-5.3	3.8
T5	-31.4	-31.3	-24.8	-6.4	-6.4	0.3
T6	-30.8	-30.2	-24.8	-5.0	-5.5	1.7
平均值 Average	-30.2±1.1	-30.1±0.9	-25.0±0.4	-6.5±1.1	-6.8±1.5	1.8±1.3

样品 Sample No.	δ¹³C值 δ¹³C value (‰)			δ¹⁵N 值δ¹⁵N value (‰)
样品 Sample No.	新生组织 New tissue	衰老组织 Senescent tissue	根际土壤 Soil rhizosphere	新生组织 New tissue	衰老组织 Senescent tissue	根际土壤 Soil rhizosphere
T1	-29.0	-29.2	-25.0	-7.2	-7.3	1.8
T2	-29.4	-29.4	-24.9	-7.6	-7.0	0.6
T3	-29.1	-29.3	-25.7	-7.4	-9.4	2.5
T4	-31.3	-30.9	-24.8	-5.5	-5.3	3.8
T5	-31.4	-31.3	-24.8	-6.4	-6.4	0.3
T6	-30.8	-30.2	-24.8	-5.0	-5.5	1.7
平均值 Average	-30.2±1.1	-30.1±0.9	-25.0±0.4	-6.5±1.1	-6.8±1.5	1.8±1.3