Effects of litter manipulation on soil respiration in natural secondary forest in subalpine area of western Sichuan Province, China

The change of litter input can affect soil respiration (Rs) by influencing the availability of soil organic carbon and nutrients, regulating soil microenvironments, thus resulting in a profound influence on soil carbon cycle of the forest ecosystem. We conducted an aboveground litterfall manipulation experiment in different-aged Betula platyphylla forests (25-, 40- and 61-year-old) of the permafrost region, located in the northeast of China, during May to October in 2018, with each stand treated with doubling litter (litter addition, DL), litter exclusion (no-litter, NL) and control litter (CK). Our results indicated that Rs decreased under NL treatment compared with CK treatment. The effect size lessened with the increase in the stand age; the greatest reduction was found for young Betula platyphylla forest (24.46% for 25-year-old stand) and tended to stabilize with the growth of forest with the reduction of 15.65% and 15.23% for 40-and 61- year-old stands, respectively. Meanwhile, under DL treatment, Rs increased by 27.38%, 23.83% and 23.58% on 25-, 40- and 61-year-old stands, respectively. Our results also showed that the increase caused by DL treatment was larger than the reduction caused by NL treatment, leading to a priming effect, especially on 40- and 61-year-old stands. The change in litter input was the principal factor affecting the change of Rs under litter manipulation. The soil temperature was also a main factor affecting the contribution rate of litter to Rs of different-aged stands, which had a significant positive exponential correlation with Rs. This suggests that there is a significant relationship between litter and Rs, which consequently influences the soil carbon cycle in Betula platyphylla forests of the permafrost region, Northeast China. Our finding indicated the increased litter enhanced the Rs in Betula platyphylla forest, which may consequently increase the carbon emission in a warming climate in the future. It is of great importance for future forest management in the permafrost region, Northeast China.

Download Full-text

Ore Genesis and Deposit Model of Carbonatite-host REE Deposits: the Mianning-Dechang REE Belt, Western Sichuan Province, China

Acta Geologica Sinica - English Edition ◽

10.1111/1755-6724.12373_29 ◽

2014 ◽

Vol 88 (s2) ◽

pp. 475-477 ◽

Cited By ~ 4

Author(s):

Yuling XIE ◽

Yingxu LI ◽

Zengqian HOU ◽

David R COOKE ◽

Leonid DANYUSHEVSKY ◽

...

Keyword(s):

Sichuan Province ◽

Ore Genesis ◽

Western Sichuan ◽

Deposit Model

Download Full-text

Comparison of soil respiration among three temperate forests in Changbai Mountains, China

Canadian Journal of Forest Research ◽

10.1139/x10-010 ◽

2010 ◽

Vol 40 (4) ◽

pp. 788-795 ◽

Cited By ~ 23

Author(s):

Xu Wang ◽

Yanling Jiang ◽

Bingrui Jia ◽

Fengyu Wang ◽

Guangsheng Zhou

Keyword(s):

Soil Respiration ◽

Soil Temperature ◽

Secondary Forest ◽

Temperature Response ◽

Stand Age ◽

Changbai Mountains ◽

Primary Forest ◽

Plantation Forest ◽

Successional Stage ◽

Coniferous Plantation

CO2 efflux from forest soils is an important process in the global carbon cycle; however, effects of stand age and successional status remain uncertain. We compared soil respiration and its relationship to soil carbon content, forest floor mass, root biomass, soil temperature, and soil moisture content among three temperate forest ecosystems in Changbai Mountains, northeastern China, from 2003 to 2005. Forest types included an old-growth, mixed coniferous and broad-leaved primary forest (MN), a middle-aged, broad-leaved secondary forest (BL), and a young coniferous plantation forest (CP). Average annual soil CO2 efflux at BL (1477.9 ± 61.8 g C·m–2·year–1) was significantly higher than at CP (830.7 ± 48.7 g C·m–2·year–1) and MN (935.4 ± 53.3 g C·m–2·year–1). Differences in soil temperature among those sites were not statistically significant but contributed to the differences in annual CO2 efflux. In addition, the temperature response of soil CO2 efflux was higher at MN (Q10 = 2.78) than that at BL (Q10 = 2.17) and CP (Q10 = 2.02). Our results suggest that successional stage affects soil respiration by the differences in substrate quantity and quality, environmental conditions, and root respiration.

Download Full-text

Thalictrum kangdingense (Ranunculaceae), a new synonym of T. megalostigma from China

Phytotaxa ◽

10.11646/phytotaxa.498.2.2 ◽

2021 ◽

Vol 498 (2) ◽

pp. 87-103

Author(s):

YOU-PAI ZENG ◽

QIONG YUAN ◽

QIN-ER YANG

Keyword(s):

Morphological Characters ◽

Sichuan Province ◽

Type Locality ◽

Type Material ◽

Herbarium Specimens ◽

Western Sichuan ◽

New Synonym ◽

Morphological Distinction ◽

In The Wild

Based on critical observations on herbarium specimens (including type material) and living plants in the wild from its type locality, we demonstrate that Thalictrum kangdingense, recently described from Kangding county in western Sichuan province, China, is readily distinguishable from T. xinningense by an array of morphological characters but is actually conspecific with T. megalostigma, a species with its type locality also in Kangding. We therefore reduce T. kangdingense to the synonymy of T. megalostigma herein. The morphological distinction between T. baicalense and T. megalostigma is also clarified.

Download Full-text

Self-government and 1911 in China: Revolution or Continuity in the Political Participation in Sichuan Province?

Ming Qing Yanjiu ◽

10.1163/24684791-01701007 ◽

2012 ◽

Vol 17 (01) ◽

pp. 165-189

Author(s):

Monica de Togni

Keyword(s):

Central Government ◽

Active Role ◽

Local Communities ◽

Sichuan Province ◽

The Political ◽

Local Policy ◽

Role Taking ◽

Local Society ◽

Western Sichuan ◽

The Creation

The process that led to the creation of self-government organs, and their activities in the first years of their existence, shows a consistent continuity between the imperial and the republican institutions, but also some changes in the institutional behaviour of the representatives of the local communities before and after the 1911’s revolution. The different meaning attributed to the institutional reforms as they appear to have been interpreted by the Qing Court, from the interpretations by the local society - a tools to control the political activism of the local notables vs a means to play a more active role in the local policy -, did not interfere with the creation of the organs of self-government, a part of the new structure to be built for the constitutional monarchy scheduled through imperial edicts on 27th August, 1908. The local activism and activities, as they are illustrated for Sichuan province through provincial and county archive documents, local gazetteers and reviews, show contradictory tendencies even as relates to some officials, and part of local communities anticipating sometimes the dispositions by the central government for the implementations of self-government, and some resistance by the people who had the right to vote in the participation to the preparatory process for the poll. However, the flourishing of self-government councils of the lower level and the fields of their interventions as representatives of the local communities show a very positive attitude on part of the local communities that continued until Yuan Shikai closed them down in 1914. This study will be concentrating on this aspect and will include, among other things, the case-study of Xuanhan county in north-western Sichuan, where a powerful local lineage played a very relevant role, taking advantage of the disruption of the provincial institutional order.

Download Full-text