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1. chinaXiv:202108.00008 [pdf]

Contrasting effects of nitrogen addition on litter decomposition in forests and grasslands in China

SU Yuan; MA Xiaofei; GONG Yanming; LI Kaihui; HAN Wenxuan; LIU Xuejun
Subjects: Geosciences >> Geography

Nitrogen (N) addition has profound impacts on litter-mediated nutrient cycling. Numerous studies have reported different effects of N addition on litter decomposition, exhibiting positive, negative, or neutral effects. Previous meta-analysis of litter decomposition under N addition was mainly based on a small number of samples to allow comparisons among ecosystem types. This study presents the results of a meta-analysis incorporating data from 53 published studies (including 617 observations) across forests, grasslands, wetlands, and croplands in China, to investigate how environmental and experimental factors impact the effects of N addition on litter decomposition. Averaged across all of the studies, N addition significantly slows litter decomposition by 7.02%. Considering ecosystem types, N addition significantly accelerates litter decomposition by 3.70% and 11.22% in grasslands and wetlands, respectively, clearly inhibits litter decomposition by 14.53% in forests, and has no significant effects on litter decomposition in croplands. Regarding the accelerated litter decomposition rate in grasslands due to N addition, litter decomposition rate increases slightly with increasing rates of N addition. However, N addition slows litter decomposition in forests, but litter decomposition is at a significantly increasing rate with increasing amounts of N addition. The responses of litter decomposition to N addition are also influenced by the forms of N addition, experiential duration of N addition, humidity index, litter quality, and soil pH. In summary, N addition alters litter decomposition rate, but the direction and magnitude of the response are affected by the forms of N addition, the rate of N addition, ambient N deposition, experimental duration, and climate factors. Our study highlights the contrasting effects of N addition on litter decomposition in forests and grasslands. This finding could be used in biogeochemical models to better evaluate ecosystem carbon cycling under increasing N deposition due to the differential responses of litter decomposition to N addition rates and ecosystem types.

submitted time 2021-08-06 From cooperative journals:《Journal of Arid Land》 Hits3079Downloads321 Comment 0

2. chinaXiv:202007.00044 [pdf]

A meta-analysis of the effect of episodic future thinking on delay discounting

Jun-yan Ye; Qing-yu Ding; Ji-fang Cui; Zhe Liu; Lu-xia Jia; Xiao-jing Qin; Hua Xu; Ya Wang
Subjects: Psychology >> Cognitive Psychology

Delay discounting (DD) is the phenomenon that individuals prefer to choose an immediate but smaller reward than a delayed but larger reward. Larger DD is considered as an indicator of impulsivity, the increased DD rate is also seen as a behavior indictor of various psychiatric disorders. Episodic future thinking (EFT) is the ability to project oneself into the future to pre-experience the future events, which can be used to reduce DD. The present study provided a meta-analysis on the efficiency of EFT in reducing DD and examined potential moderators. Thirty-seven studies including 48 contrasts were included, results showed that EFT reduced DD significantly. Moderator and meta-regression analyses revealed that positive EFT was more efficient in reducing DD. In addition, several factors related to DD task (e.g., whether the DD money is hypothetical or potential real, whether the delay reward is fixed or variable, and the indexes of DD) were related to the efficiency of EFT in reducing DD. These results have implications for using EFT to reduce DD in the future.

submitted time 2020-07-27 Hits7633Downloads1564 Comment 0

3. chinaXiv:202002.00012 [pdf]

Horizontal but not vertical saccades enhance memory retrieval: a meta-analysis and systematic review

Qin, Xiao-jing; Yang, Han-xue ; Cui, Ji-fang ; Ye, Jun-yan ; Wang, Ya
Subjects: Psychology >> Cognitive Psychology

BACKGROUND: Saccade-induced retrieval enhancement (SIRE) refers to the phenomenon that active engaging of horizontal eye movements before recall would enhance subsequent memory performance. This effect is generally thought to be the result of interhemispheric interaction stimulated by saccades. Nonetheless, recent findings do not fully support this hypothesis. An alternative explanation is that saccades promote memory retrieval by improving top-down attention control. Thus, the mechanisms of SIRE are unclear, the present meta-analysis quantitatively analyzed the effect of saccades on memory performance and examined the mechanisms of SIRE through moderator analysis. METHODS: We searched "Web of Science", "PubMed", and "Springer" for peer reviewed papers using the keywords "eye movements + memory" and "saccades + memory". Twenty-two papers were included in the final analysis. RESULTS: There was a significant facilitation of horizontal saccades on overall memory performance, with a pooled effect size (Cohen’s d) of 0.45 (p < 0.001). However, the overall effect of vertical saccades was not significant (d = 0.1, p = 0.14). Moderation analysis showed that the handedness of participants was a significant moderator of the SIRE, with strongly right-handed individuals benefited more from horizontal saccades than non-strongly right-handed individuals (p < 0.01). CONCLUSION: Horizontal saccades improved memory performances, particularly for the strongly right-handed individuals, these results support the interhemispheric interaction hypothesis.

submitted time 2020-02-05 Hits16479Downloads1323 Comment 0

4. chinaXiv:202002.00010 [pdf]

A Meta-Analysis of Mental Time Travel Impairments in Autism Spectrum Disorders

Jun-yan Ye; Xiao-jing Qin; Ji-fang Cui; Lu-xia Jia; Ya Wang; Christos Pantelis; Raymond CK Chan
Subjects: Psychology >> Medical Psychology

Individuals with autism spectrum disorders (ASD) have a wide range of cognitive impairments. Mental time travel (MTT) is the ability to mentally re-experience past events and pre-experience possible future events. Studies have shown MTT impairments in individuals with ASD, however, these findings may be confounded by a number of factors including verbal ability to report MTT, factors related to MTT task and demographic factors of participants. The present study provided a meta-analysis on MTT deficits in individuals with ASD and examined the potential moderating variables for these impairments. Twenty-six studies were included, and the participants comprised 667 individuals with ASD and 671 healthy controls. Results showed significant overall MTT impairments (Cohen’s d = ?0.95) in individuals with ASD. Moderator and meta-regression analyses revealed that verbal IQ was significantly related to MTT impairments; type of MTT, type of task, measurement indices of MTT, age of participants, gender ratio and full IQ did not explain the MTT impairments. These findings suggest that MTT is severely impaired in individuals with ASD, verbal IQ contributed to MTT impairments, and task characteristics did not affect the degree of impairments.

submitted time 2019-11-05 Hits13501Downloads1509 Comment 0

5. chinaXiv:201712.01010 [pdf]


LIU Zongrui; ZHAO Hao; CHEN Yanrong; TANG Dongdong; and NIU Hongxin
Subjects: Medicine, Pharmacy >> Preclinical Medicine

目的 评价医用射线防护剂对头颈部鳞癌患者颈部皮肤放射性损伤的防护效果。方法 65例实施调强放疗的头颈部鳞状细胞癌初治患者,随机分为两组,空白对照组32例,对其进行常规皮肤护理指导;试验组33例,除常规护理外,每日使用医用射线防护剂3~5次,直至放疗结束后1周。结果 对照组发生严重皮肤黏膜放射性损伤明显高于试验组(P<0.05);与对照组相比,试验组可明显延缓颈部皮肤的放射性损伤,试验组患者放疗结束后皮肤损伤的愈合更快(P<0.05)。结论 医用射线防护剂能有效地降低放射性皮肤损伤。

submitted time 2017-12-27 From cooperative journals:《南方医科大学学报》 Hits873Downloads550 Comment 0

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